Filters: Tags: Alaska (AK) (X) > Types: OGC WMS Service (X)
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Alaska. Kodiak Village. The hill back of the village was sculptured by an ice sheet moving from left to right. The stream gorge is of later formation. Harriman Expedition, 1899.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Alaska (AK),
Gilbert, G.K. Collection,
Photographers,
photo print
Alaska. Gently dipping conglomerate, sandstone and siltstone of Summit Island Formation on the southeast end of Summit Island. View is northwest. 1976.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Alaska (AK),
Hill, J.M. Collection,
Photographers,
color transparency (slides)
In 1987, the Bureau of Mines compiled references of publications which discuss coastal geology and mineral deposits (other than mineral fuels and construction materials) in Alaska. This work was initially conducted for use in the Bureau's Offshore Nome economic analysis. Publications have been indexed by topographic quadrangle and appear in the appendix of this report.
The Alaska State Director of the Bureau of Land Management requested the U.S. Bureau of Mines to evaluate the mineral resources and mine hazards of the Fortymile River and Black River Planning Subunits located in east -central Alaska. The subunits comprise about 16,188 square km (4 million acres). This report compiles the historic mining and exploration activity and analytical results from the phase I reconnaissance of the planning subunits. This data, combined with results from phase II (1995), will be used in a probabilistic assessment of the mineral resource potential for the planning subunits. Mineral occurrences and geochemical anomalies were sampled with the intent to verify and characterize mineral deposits....
In 1991 and 1992, the Bureau of Mines completed chromium, platinum -group metals (PGM), and tin investigations, and started indium, manganese, titanium, and vanadium investigations in Alaska. These studies were done as part of the Site Specific Minerals Investigations project. As a result of this work, the Bureau found PGM- bearing composite plutons in the Yentna River area of the Alaska Range, which are chemically similar to composite plutons in other parts of the Alaska Range and to Ural -Alaskan type complexes. Previously unknown chromium and PGM occurrences were found in the western Brooks Range. A compilation report on the Bureau's chromium and PGM investigations in the western Brooks Range was also published....
Marine disposal of mill tailings has been practiced worldwide for over a century. However, only recently have the environmental effects of marine disposal been systematically studied. Some early attempts at marine disposal of tailings resulted in adverse impacts to marine life. However, recent advances in tailings disposal methods have included the introduction of engineered submarine tailings discharge systems, advanced environmental assessment and monitoring methods, and oceanographic modeling systems. Successful submarine tailings disposal (STD) has occurred at several mines. The U.S. Bureau of Mines (BOM) has undertaken studies of the disposal of mining and milling wastes in the marine environment. The BOM Alaska...
(THIS VERSION HAS BEEN SUPERSEDED by US-RIIS V2.0, November 2022, available at https://doi.org/10.5066/P9KFFTOD) Introduced (non-native) species that becomes established may eventually become invasive, so tracking introduced species provides a baseline for effective modeling of species trends and interactions, geospatially and temporally. The United States Register of Introduced and Invasive Species (US-RIIS) is comprised of three lists, one each for Alaska (AK, with 532 records), Hawaii (HI, with 6,075 records), and the conterminous United States (L48, with 8,657 records). Each list includes introduced (non-native), established (reproducing) taxa that: are, or may become, invasive (harmful) in the locality; are...
Categories: Data;
Types: Data,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Alaska (AK),
Aquatic Biology,
Botany,
Conterminous United States (L48),
Ecology,
Cobalt minerals or anamolous concentrations of cobalt associated with sulfide minerals have been identified in 21 deposits in Alaska. Undoubtedly other deposits exist because there has been little economic incentive to search for cobalt in Alaska and none has been produced. In the known deposits, cobalt occurs in trace amounts recoverable only if the deposit is mined for other minerals and if the cobalt can be concentrated during mining and milling. Two of the known cobalt occurrences (Brady Glacier and Yakobi Island) are in large copper -nickel deposits. A third (Bornite) is associated with a large copper sulfide deposit. A fourth occurrence (Jarvis Glacier) was recently discovered in a geologic setting possibly...
Regulatory processes associated with development of a world class lead -zinc mine, Red Dog Mine, in northwestern Alaska were reviewed and evaluated. Informal interviews with key project personnel, consultants, and agency field and permitting specialists provided perspective on the regulatory successes and failures of the project. Due to potential impacts to air quality, water quality, wetlands, and National Park lands, an Environmental Impact Statement was required. By developing a comprehensive baseline of information on the existing environment to aid in minimizing impacts during project siting /design and through regular coordination of evolving project plans with regulatory agencies, the mine developers were...
The Bureau of Mines investigated submarine tailings disposal (STD) as an alternative to on -land tailings disposal. This report evaluates coastal metal deposits in the United States that may be amenable to STD. A pre -feasibility economic analysis comparing the two methods for twenty deposits in Alaska was completed. Environmental aspects of the deposits and potential effects of STD on minerals availability were evaluated. On average, Net Present Values (NPV) were 22.3% larger for STD than for on -land disposal, due to a 17.0% reduction in capital costs, a 1.6% increase in operating costs, and a 7.1% reduction in breakeven prices. Although STD has substantial promise for Alaska, a policy change would have little...
This data set represents probabilisitic seismic hazard curves and uniform-hazard ground motion values calculated for a grid of points with a spacing of 0.2 degrees in latitude and longitude over the conterminous U.S. (CONUS) and Alaska (AK) using the 2023 National Seismic Hazard Model. CONUS The data sets includes (1) probabilistic seismic hazard curves (full and truncated) for two peak parameters, peak ground velocity (PGV) and peak ground acceleration (PGA), and pseudo-spectral accelerations at 21 oscillator periods between 0.01 and 10s, and (2) uniform-hazard ground motion values for 2, 5, and 10% in 50 years probability of exceedance (PE) (corresponding to 2,475, 975, and 475-year return periods, respectively)...
This U.S. Bureau of Mines publication presents a case study of the processes used in permitting the Nome Offshore Placer Project, a gold mining project offshore Nome, Alaska which operated from 1985 through 1990. The mining project, developed by Western Gold Exploration and Mining Company, Limited Partnership (WestGold), used the BIMA, which was at the time the largest bucketline mining vessel in the world, to dredge gold from the ocean floor. This case study reviews the permitting process from the regulators' and industry's perspectives, as well as characterizing the efficiencies and inefficiencies associated with this case. The Federal, State and local laws applicable to the Nome Offshore Placer Project are identified,...
A review and synthesis of literature pertaining to biological consequences of submarine mine - tailings disposal (STD) was conducted. STD can result in massive sea floor sediment deposition. STD may also increase suspended sediment, trace metals, and residual milling reagents in receiving waters. These perturbations, which are highly site dependent, invariably smother benthic organisms, and could potentially affect or alter fish, plankton, and benthos through acute and chronic toxicity, bioaccumulation, behavioral changes, smothering, derived secondary effects, and habitat alteration. Much of the available information concerning STD is unpublished and limited to a restricted number of sites. From this information...
NOTE: A more current version of the Protected Areas Database of the United States (PAD-US) is available: PAD-US 2.1 https://doi.org/10.5066/P92QM3NT. The USGS Protected Areas Database of the United States (PAD-US) is the nation's inventory of protected areas, including public land and voluntarily provided private protected areas, identified as an A-16 National Geospatial Data Asset in the Cadastre Theme (https://communities.geoplatform.gov/ngda-cadastre/). The PAD-US is an ongoing project with several published versions of a spatial database including areas dedicated to the preservation of biological diversity, and other natural (including extraction), recreational, or cultural uses, managed for these purposes...
Categories: Data,
Map;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Agricultural Research Service,
Alabama (AL),
Alaska (AK),
American Samoa (AS),
Arizona (AZ),
As part of a cooperative project during 1983-1985 personnel from the State of Alaska, Division of Geological and Geophysical. Surveys and the U.S. Bureau of Mines collected 687 stream sediment, pan concentrate, soil, float, rubblecrop, and bedrock samples in the Porcupine mining area near Haines in Southeast Alaska. More than 460 of the 687 samples collected contained anomalous concentrations of one or more elements, indicating the possible presence of several deposit types. Types include zinc -silver -lead- barium volcanic or sedimentary hosted massive sulfide deposits, gold -silver or base metal vein deposits, and sedimentary hosted large tonnage low -grade gold and gold bearing copper cobalt skarn deposits. Stream...
Unverified reports of rare earth element (REE) concentrations in gold placers and radioactive mineral prospects in the Zane Hills were investigated by the U.S. Bureau of Mines as part of the Alaska critical minerals program. REE is reported to occur in dredge concentrates at the Hogatza mine and up to 1.2 pct REE was previously analyzed in alkalic syenite (bostonite) dikes marginal to the pluton. In addition, numerous thorium -rich veins, explored for their uranium content but unevaluated for REE, occur on the western margin of the Zane Hills. The Bureau mapped and sampled all of the reported or suspected REE occurrences. Dredge concentrates contain abundant uranothorianite, a mineral species which incorporates...
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