This service presents location, status, and other information regarding mining operations regulated under the Surface Mining and Reclamation Act of 1975 (SMARA) in California. The data presented in this service is reported by mine operators in annual reports provided to the California Department of Conservation Division of Mine Reclamation (DMR) under Public Resources Code section 2207. While DMR attempts to populate Mines Online with accurate map coordinate data, the DMR cannot guarantee the accuracy of operator-reported location information.

This dataset includes ten maps, scanned in large format, that were appended to A. J. Troop's MSc Thesis from 1949, "The geology of the Ogama-Rockland gold mine."

This map is meant to display locations of prospecting company Aston Bay LTD's activity in Buckingham Co and give context to the potential sites where mining may be sought in the near future.Purpose:Virginia has a long history with gold mining, mostly small, "artisanal" mines, though activity declined after the California Gold Rush. Gold mining has a particularly poor environmental record, due to the chemicals involved, the scale of mining facilities, and a general lack of responsible operations and cleanup in the industry. Some large scale minerals mining, most notably of kaolinite, already occurs in Buckingham County. But, many county residents are concerned about the prospect of large-scale gold mining and the potential for significant environmental impacts and disruptions to daily life. In addition to gold prospecting locations and properties, this map shows where gold-bearing geology exists, where mining has occurred in the past and where it is presently permitted. It also shows public drinking water systems that use surface waters and are downstream of the gold/pyrite belt.

AbstractThis paper uses the random forest (RF) algorithm to produce two maps of orogenic gold prospectivity (MPM) across the entire Superior geologic province of Ontario and Quebec, Canada. One MPM of this entire study area is based on a compilation of mapped faults while the other is based on a manual interpretation of lineaments from airborne magnetic data. In addition, we have created four MPMs over the Abitibi region as the MPM map of the entire Superior is characterized by a mapping bias due to more intense mapping of faults over the Abitibi portion of the study area with respect to the rest of the Superior province. There are three RF maps generated over the Abitibi region based on faults, fault density and fault intersection density, faults + magnetic data and faults + gravity + magnetic data. To reduce the effect of the fault mapping bias, we developed a fourth map based on a knowledge driven (weighted sum technique). Statistically the best MPM is based on the faults, gravity and magnetic data. The major predictors of gold are NW-SE, NE-SW, EW trending faults, fault intersection density between EW and NW trending faults and to a lesser extent fault density and a magnetic vertical gradient image. In addition, we compare two greenstone belts in three dimensions with respect to their potential for gold exploration. We conclude that the Larder Lake greenstone belt is more fertile with respect to gold mineralization than the Swayze greenstone belt due to deeper penetrating faults which have greater potential for tapping gold mineralized fluid from the mantle or lower crust. Our final MPM map has identified prospective areas that contain known gold mines as well as areas that do not contain any known gold mines. These prospective areas may be prime for orogenic gold exploration.

This data set maps and describes the geology of the Steele Peak 7.5' quadrangle, Riverside County, California. Created using Environmental Systems Research Institute's ARC/INFO software, the data base consists of the following items: (1) a map coverage containing geologic contacts and units, (2) a coverage containing structural data, (3) a coverage containing geologic unit annotation and leaders, and (4) attribute tables for geologic units (polygons), contacts (arcs), and site-specific data (points). In addition, the data set includes the following graphic and text products: (1) a postscript graphic plot-file containing the geologic map, topography, cultural data, a Correlation of Map Units (CMU) diagram, a Description of Map Units (DMU), and a key for point and line symbols, and (2) PDF files of the Readme (including the metadata file as an appendix), and the graphic produced by the Postscript plot file. The Steele Peak quadrangle is located in the northern part of the Peninsular Ranges Province within the central part of the Perris block, a relatively stable, rectangular in plan area located between the Elsinore and San Jacinto fault zones. The quadrangle is underlain by Cretaceous and older basement rocks. Cretaceous plutonic rocks are part of the composite Peninsular Ranges batholith. A wide variety of mafic to intermediate composition granitic rocks occur in the quadrangle, and are mainly of tonalitic composition, but range from monzogranite to gabbro. Most rock units are faintly to intensely foliated, compositionally heterogenous, and contain varying amounts of meso-and melanocratic discoidal-shaped inclusions. Some rocks are composed almost wholly of inclusion material and some are migmatitic. Included within these granitic rocks are septa not shown on the geologic map of Paleozoic(?) schist of upper amphibolite metamorphic grade. Metamorphic rocks of primarily Mesozoic age occur in a discontinuous belt extending from the southeast to the northwest corner of the quadrangle. Most of these rocks are well foliated biotite-bearing schist. Near the southern edge of the quadrangle phyllitic rocks dominate. Northwestward, metamorphism increases from greenschist or sub-greenschist grade near the south edge of the quadrangle to sillimanite-bearing schist of upper amphibolite grade in the vicinity of Cajalco Road. Biotite-hornblende tonalite of the relatively large Val Verde pluton dominates the northeastern half of the quadrangle. In most places this tonalite has a northwest oriented crude to well developed planar fabric produced by oriented biotite and hornblende. Schlieren and massive clots of mafic tonalite locally occur. Discoidal- to pancake-shaped mafic inclusions are widespread and are oriented in the plane defined by the biotite and hornblende. This planar fabric typically dips moderately to the northeast, but locally shallows to a horizontal to subhorizontal planar fabric, or fades to an isotropic fabric. West of the Val Verde pluton are a number of plutons having fabrics ranging from massive isotropic to foliated. Compositions of these plutons range from monzogranite to pyroxene gabbro. Most of these granitic rocks fall within the composition range from monzogranite to tonalite, and are part of the composite Gavilan ring complex. Hypersthene is a characteristic mineral of most of the rocks of this complex, which includes black hypersthene-bearing monzogranite that has been quarried as a source of 'black granite' building stone. Several inactive gold mines, e.g., Goodhope, Gavilan, and Santa Rosa mines that constituted the Pinacate mining district, are located in the Gavilan ring complex. In the center of the Gavilan ring complex is the near circular Arroyo del Toro pluton, a massive-textured granodiorite essentially devoid of inclusions. Only the northern half of this pluton is located in the quadrangle. Some rock of this pluton was quarried for building stone. The southwestern corner of the quadrangle is underlain by siliceous volcanic and volcanoclastic rock considered to be coeval with the batholith and be the supra-part of the batholithic magmatism. Most of these volcanic rocks range in composition from rhyolite to andesite with latitic composition rocks predominating. In the northeastern part of the quadrangle is the proximal parts of a Pleistocene alluvial fan complex. The geologic map data base contains original U.S. Geological Survey data generated by detailed field observation recorded on 1:24,000 scale aerial photographs. The map was created by transferring lines from the aerial photographs to a 1:24,000 scale topographic base. The map was digitized and lines, points, and polygons were subsequently edited using standard ARC/INFO commands. Digitizing and editing artifacts significant enough to display at a scale of 1:24,000 were corrected. Within the database, geologic contacts are represented as lines (arcs), geologic units are polygons, and site-specific data as points. Polygon, arc, and point attribute tables (.pat, .aat, and .pat, respectively) uniquely identify each geologic datum.

URL: https://geoscience.data.qld.gov.au/dataset/cr055276

GSQ PUBLICATION 119, ON THE TIN MINES OF WATSONVILLE, AND ON VARIOUS TIN, SILVER, GOLD, AND COPPER MINES AT HERBERTON, MOUNT ALBION, IRVINEBANK, MULDIVA, CALCIFER, CHILLAGOE, CALIFORNIA CREEK, THE TATE RIVER, MAREEBA ETC (WITH MAPS AND SECTIONS)

Map and report listing information on 419 mineral ocurrences in Yukon that contain noteworthy amounts of gold and/or silver. A capsule description of the occurrence's geology is present along with a list of the significant ore minerals. This is followed by information on the metal content of the occurrence and extent of exploration and development work. Accompanying this report is a 1:2,000,000-scale map of gold-silver deposits and occurrences in the Yukon Territory.

The purpose of this dataset is to provide quantitative analysis on specific commodities, offering insights into: - The total amount of specific commodities, e.g., Gold, in Yukon's hard rock deposits. - The highest-grade and largest deposits in Yukon. - The distribution of mineral resources within multiple zones in a deposit. - Source reports, direct links, and confidence levels for each mineral resource statement. - Differentiation between 43-101, JORC, and historical estimates. The resources in this dataset have been summarized and averaged to show the total geologic resource for a property or zone. For the exact numbers, please refer to the NI 43-101 compliant resource statement. +-----------------------------------+-----------------------------------+ | Field\ | Description\ | | \ | \ | +-----------------------------------+-----------------------------------+ | Property\ | Property for which deposit | | \ | resource was calculated.\ | | | \ | +-----------------------------------+-----------------------------------+ | Zone\ | Zone for which deposit resource | | \ | was calculated.\ | | | \ | +-----------------------------------+-----------------------------------+ | 43-101 Compliant\ | If the resource calculation is NI | | \ | 43-101 compliant, JORC compliant, | | | or historic.\ | | | \ | +-----------------------------------+-----------------------------------+ | Commodities\ | The types of commodities | | \ | contained in the resource | | | calculation, order is | | | alphabetic.\ | | | \ | +-----------------------------------+-----------------------------------+ | Categories\ | The resource categories used to | | \ | create the calculation. This | | | indicates the level of certainty | | | of the calculation.\ | | | \ | +-----------------------------------+-----------------------------------+ | Resource / Reserve\ | If the resource calculation is | | \ | considered to be a reserve or | | | resource. A reserve factors | | | economic factors an | | | extractability of the deposit | | | into account.\ | | | \ | +-----------------------------------+-----------------------------------+ | Tonnage\ | The total tonnage of the deposit\ | | \ | \ | +-----------------------------------+-----------------------------------+ | AVG_AU_GT\ | The average grade of gold in the | | \ | deposit, in grams per metric | | | tonne.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_AU_OZ\ | The total contained gold, in troy | | \ | ounces.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_AG_GT\ | The average grade of silver in | | \ | the deposit, in grams per metric | | | tonne.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_AG_OZ\ | The total contained silver, in | | \ | troy ounces.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_CU_PCT\ | The average grade of copper in | | \ | the deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_CU_LBS\ | The total contained gold, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_MO_PCT\ | The average grade of molybdenum | | \ | in the deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_MO_LBS\ | The total contained molybdenum, | | \ | in pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_PB_PCT\ | The average grade of lead in the | | \ | deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_PB_LBS\ | The total contained lead, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_ZN_PCT\ | The average grade of zinc in the | | \ | deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_ZN_LBS\ | The total contained zinc, in | | \ | pounds\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_NI_PCT\ | The average grade of nickel in | | \ | the deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_NI_LBS\ | The total contained nickel, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_CO_PCT\ | The average grade of cobalt in | | \ | the deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_CO_LBS\ | The total contained cobalt, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_WO3_PCT\ | The average grade of tungsten | | \ | trioxide in the deposit, in | | | percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_WO3_LBS\ | The total contained tungsten | | \ | trioxide, in pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_SN_PCT\ | The average grade of tin in the | | \ | deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_SN_LBS\ | The total contained tin, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_SB_PCT\ | The average grade of antimony in | | \ | the deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_SB_LBS\ | The total contained antimony, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_FE_PCT\ | The average grade of iron in the | | \ | deposit, in percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_FE_LBS\ | The total contained iron, in | | \ | pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_PT_GT\ | The average grade of platinum in | | \ | the deposit, in grams per metric | | | tonne.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_PT_OZ\ | The total contained platinum, in | | \ | troy ounces.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_PD_GT\ | The average grade of palladium in | | \ | the deposit, in grams per metric | | | tonne.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_PD_OZ\ | The total contained palladium, in | | \ | troy ounces.\ | | | \ | +-----------------------------------+-----------------------------------+ | AVG_BASO4_PCT\ | The average grade of barium | | \ | sulphate in the deposit, in | | | percentage.\ | | | \ | +-----------------------------------+-----------------------------------+ | TOTAL_BASO4_TONNES\ | The total contained barium | | \ | sulphate, in pounds.\ | | | \ | +-----------------------------------+-----------------------------------+ | REFERENCE_DATE\ | The date of the resource | | \ | calculation.\ | | | \ | +-----------------------------------+-----------------------------------+ | URL\ | The link to the report or graphic | | \ | containing the resource | | | calculation.\ | | | \ | +-----------------------------------+-----------------------------------+ | LATITUDE_DD\ | Y-Location, geographic center of | | \ | zones.\ | | | \ | +-----------------------------------+-----------------------------------+ | LONGITUDE_DD\ | X-Location, geographic center of | | \ | zones.\ | | | \ | +-----------------------------------+-----------------------------------+ Distributed from GeoYukon(target="_blank" style="text-decoration:underline;" rel="nofollow ugc noopener noreferrer") by the Government of Yukon(target="_blank" style="text-decoration:underline;" rel="nofollow ugc noopener noreferrer") . Discover more digital map data and interactive maps from Yukon's digital map data collection. For more information: geomatics.help@yukon.ca(target="_blank" style="text-decoration:underline;" rel="nofollow ugc noopener noreferrer")

This dataset was developed to provide mineral resource data for the region of northeast WA for use in future spatial analysis by a variety of users.

This database is not meant to be used or displayed at any scale larger than 1:24,000

This report is a tabular presentation of mineral activities for mining and exploration in Washington during 1985 to 1997. The data may be incomplete as it depended on published data or data volunteered by operators.

The map and descriptions offer information that may be used for: land-use planning (e.g. selecting land fill sites, greenbelts, avoiding geologic hazards), for finding aggregate resources (crushed rock, sand, and gravel), for study of geomorphology and Quaternary geology. Geologic hazards (e.g., landslides, swelling soils, heaving bedrock, and flooding) known to be located in, or characteristic of some mapped units, were identified.

Surficial deposits in the quadrangle partially record depositional events of the Quaternary Period (the most recent 1.8 million years). Some events such as floods are familiar to persons living in the area, while other recorded events are pre-historical. The latter include glaciation, probable large earthquakes, protracted drought, and widespread deposition of sand and silt by wind. At least twice in the past 200,000 years (most recently about 30,000 to 12,000 years ago) global cooling caused glaciers to form along the Continental Divide. The glaciers advanced down valleys in the Front Range, deeply eroded the bedrock, and deposited moraines (map units tbg, tbj) and outwash (ggq, gge). On the plains (east part of map), eolian sand (es), stabilized dune sand (ed), and loess (elb) are present and in places contain buried paleosols. These deposits indicate that periods of sand dune deposition alternated with periods of stabilized dunes and soil formation.

Thirty-nine types of surficial geologic deposits and residual materials of Quaternary age are described and mapped in the greater Denver area, in part of the Front Range, and in the piedmont and plains east of Denver, Boulder, and Castle Rock. Descriptions appear in the pamphlet that accompanies the map. Landslide deposits, colluvium, residuum, alluvium, and other deposits or materials are described in terms of predominant grain size, mineral or rock composition (e.g., gypsiferous, calcareous, granitic, andesitic), thickness of deposits, and other physical characteristics. Origins and ages of the deposits and geologic hazards related to them are noted. Many lines between geologic units on our map were placed by generalizing contacts on published maps. However, in 1997-1999 we mapped new boundaries, as well. The map was projected to the UTM projection. This large map area extends from the Continental Divide near Winter Park and Fairplay ( on the west edge), eastward about 107 mi (172 km); and extends from Boulder on the north edge to Woodland Park at the south edge (68 mi; 109 km).

Compilation scale: 1:250,000. Map is available in digital and print-on-demand paper formats. Deposits are described in terms of predominant grain size, mineralogic and lithologic composition, general thickness, and geologic hazards, if any, relevant geologic historical information and paleosoil information, if any. Thirty- nine map units of deposits include 5 alluvium types, 15 colluvia, 6 residua, 3 types of eolian deposits, 2 periglacial/disintegrated deposits, 3 tills, 2 landslide units, 2 glaciofluvial units, and 1 diamicton. An additional map unit depicts large areas of mostly bare bedrock.

The physical properties of the surficial materials were compiled from published soil and geologic maps and reports, our field observations, and from earth science journal articles. Selected deposits in the field were checked for conformity to descriptions of map units by the Quaternary geologist who compiled the surficial geologic map units.

FILES INCLUDED IN THIS DATA SET:

denvpoly: polygon coverage containing geologic unit contacts and labels. denvline: arc coverage containing faults. geol_sfo.lin: This lineset file defines geologic line types in the geologically themed coverages. geoscamp2.mrk: This markerset file defines the geologic markers in the geologically themed coverages. color524.shd: This shadeset file defines the cmyk values of colors assigned to polygons in the geologically themed coverages.

This digital product is a compilation of geological data which was collected as part of the mapping of the Meguma Terrane of southwestern Nova Scotia by C.E. White. The principal goals of this project are to produce a series of 1:50 000 scale geological bedrock maps of the area, to describe and interpret the sedimentary, igneous, metamorphic and deformational history of the Cambrian to Early Devonian metamorphic rocks, and to evaluate the area’s economic potential. The data was used to create Open File Maps OFM ME 2012-076 to 2012-101, compiled by C. E. White, 2012. The digital product was created by Geoscience and Mines Branch staff. The original digital data was compiled from a number of sources and supplemented by field done during the course of the project. The digital product contains layers for geological features such as: age dates, anticlines/synclines, areas of concentrated drilling, drillholes, dykes, faults, fossils, bedrock geologic units, geological contacts, gold districts, mines, mineral occurrences, small outcrops, quarries, shafts, stockworks, structural data, and shear zones.

This 1:50,000-scale geologic map represents a compilation of the most recent geologic studies of the upper Arkansas River valley, between Leadville and Salida, Colorado. The valley is structurally controlled by an extensional fault system that forms part of the prominent northern Rio Grande rift, an intra-continental region of crustal extension. This work also incorporates new detailed geologic mapping of poorly understood areas within the map area and reinterprets previously studied areas, aided by lidar data that covers 59 percent of the map area. The mapped region extends into the Proterozoic metamorphic and intrusive rocks in the Sawatch Range west of the valley and the Mosquito Range to the east. Paleozoic rocks are preserved along the crest of the Mosquito Range, but most of them have been eroded from the Sawatch Range. Numerous new isotopic ages (U-Pb zircon ages for the intrusive Proterozoic and some Tertiary rocks adjacent to the valley and 40Ar/39Ar ages for the Late Cretaceous to Oligocene intrusive and extrusive rocks) better constrain the timing of both Proterozoic and Late Cretaceous to early Tertiary intrusive events. The U-Pb ages document widespread ~1,440-Ma granitic plutonism north of Buena Vista that produced batholiths that intruded an older suite of ~1,760-Ma metamorphic rocks and ~1,700-Ma plutonic rocks. As a result of extension during the Neogene and possibly latest Paleogene, the graben underlying the valley is filled with thick basin-fill deposits (Dry Union Formation and older sediments), which occupy two sub-basins, separated by a bedrock high near the small town of Granite. The Dry Union Formation has undergone deep erosion since the late Miocene or early Pliocene. During the Pleistocene, ongoing steam incision by the Arkansas River and its major tributaries has been interrupted by periodic aggradation. From Leadville south to Salida as many as 7 mapped alluvial depositional units, which range in age from early to late Pleistocene, record periodic aggradational events along these streams that are commonly associated with deposition of glacial outwash or bouldery glacial-flood deposits. Many previously unrecognized Neogene and Quaternary faults, some of the latter with possible Holocene displacement, have been identified on lidar imagery. This imagery has also permitted more accurate remapping of glacial, fluvial, and mass-movement deposits and has aided in the determination of their relative ages. Recently published 10Be cosmogenic surface-exposure ages, coupled with new geologic mapping, have revealed the timing and rates of late Pleistocene deglaciation. Glacial dams that impounded the Arkansas River at Clear Creek and possibly at Pine Creek failed at least 3 times during the middle and late Pleistocene, resulting in catastrophic floods and deposition of enormous boulders and bouldery alluvium downstream; at least two failures occurred during the late Pleistocene during the Pinedale glaciation.

This digital geologic map of the Nevada Test Site (NTS) and vicinity, as well as its accompanying digital geophysical maps, are compiled at 1:100,000 scale. The map compilation presents new polygon (geologic map unit contacts), line (fault, fold axis, metamorphic isograd, dike, and caldera wall) and point (structural attitude) vector data for the NTS and vicinity, Nye, Lincoln, and Clark Counties, Nevada, and Inyo County, California. The map area covers two 30 x 60-minute quadrangles-the Pahute Mesa quadrangle to the north and the Beatty quadrangle to the south-plus a strip of 7.5-minute quadrangles on the east side-72 quadrangles in all. In addition to the NTS, the map area includes the rest of the southwest Nevada volcanic field, part of the Walker Lane, most of the Amargosa Desert, part of the Funeral and Grapevine Mountains, some of Death Valley, and the northern Spring Mountains. This geologic map improves on previous geologic mapping of the same area (Wahl and others, 1997) by providing new and updated Quaternary and bedrock geology, new geophysical interpretations of faults beneath the basins, and improved GIS coverages. Concurrent publications to this one include a new isostatic gravity map (Ponce and others, 1999) and a new aeromagnetic map (Ponce, 1999).

The locations of principal faults and structural zones that may influence ground-water flow were compiled in support of a three-dimensional ground-water model for the Death Valley regional flow system (DVRFS), which covers 80,000 square km in southwestern Nevada and southeastern California. Faults include Neogene extensional and strike-slip faults and pre-Tertiary thrust faults. Emphasis was given to characteristics of faults and deformed zones that may have a high potential for influencing hydraulic conductivity. These include: (1) faulting that results in the juxtaposition of stratigraphic units with contrasting hydrologic properties, which may cause ground-water discharge and other perturbations in the flow system; (2) special physical characteristics of the fault zones, such as brecciation and fracturing, that may cause specific parts of the zone to act either as conduits or as barriers to fluid flow; (3) the presence of a variety of lithologies whose physical and deformational characteristics may serve to impede or enhance flow in fault zones; (4) orientation of a fault with respect to the present-day stress field, possibly influencing hydraulic conductivity along the fault zone; and (5) faults that have been active in late Pleistocene or Holocene time and areas of contemporary seismicity, which may be associated with enhanced permeabilities. The faults shown on maps A and B are largely from Workman and others (in press), and fit one or more of the following criteria: (1) faults that are more than 10 km in map length; (2) faults with more than 500 m of displacement; and (3) faults in sets that define a significant structural fabric that characterizes a particular domain of the DVRFS. The following fault types are shown: Neogene normal, Neogene strike-slip, Neogene low-angle normal, pre-Tertiary thrust, and structural boundaries of Miocene calderas. We have highlighted faults that have late Pleistocene to Holocene displacement (Piety, 1996). Areas of thick Neogene basin-fill deposits (thicknesses 1-2 km, 2-3 km, and >3 km) are shown on map A, based on gravity anomalies and depth-to-basement modeling by Blakely and others (1999). We have interpreted the positions of faults in the subsurface, generally following the interpretations of Blakely and others (1999). Where geophysical constraints are not present, the faults beneath late Tertiary and Quaternary cover have been extended based on geologic reasoning. Nearly all of these concealed faults are shown with continuous solid lines on maps A and B, in order to provide continuous structures for incorporation into the hydrogeologic framework model (HFM). Map A also shows the potentiometric surface, regional springs (25-35 degrees Celsius, D'Agnese and others, 1997), and cold springs (Turner and others, 1996).

Pentlandite-bearing serpentinized ultramafic flows with a komatiitic composition have been identified within volcano-sedimentary stratigraphy in the Nadaleen Range. Associated listwaenites or silica-carbonate-fuchsite-altered serpentinites carry locally significant gold, copper, nickel and cobalt values. The occurrence of laterally extensive ultramafi c units at the northern edge of the Selwyn Basin remains difficult to explain within the current scope of geological knowledge in the area. However, it represents a new style of exploration target for copper-nickel-bearing massive sulphide deposits, as well as listwaenite-associated gold.

This map depicts the 32 precious-metal mines that operated for any period during 2004. Precious-metal mines produce gold, silver, palladium and uranium. There were no active precious-metal mines in the Yukon Territory, Alberta, Prince Edward Island, New Brunswick or Nova Scotia for this year. The locations of 2 uranium-processing facilities and 2 precious-metal refineries are shown to provide an industrial context for precious-metal mining activity.