The data below represent everything available in the MBMG Abandoned and Inactive Mines (AIM) database.

Sites Table
AIM Id Name Alternate Name District County
BE000912 H & S MINE, HOFFMAN & STEELE CHINATOWN BEAVERHEAD
MRDS AMLI MILS Latitude Longitude Datum
W013426 300010048 44.8894 -113.1939
Township Range Section QSection UTM Northing UTM Easting UTM Zone UTM Datum
11S 13W 9 CADA 4972825 326729 12
Average Elevation Elev Units Land Owner 250K Quad 100K Quad 24K Quad
7480 F DUBOIS LEADORE JEFF DAVIS PEAK
Property Type Update Date Who Updated
LODE 8/25/1998 PAH
Commodities Table
Commodities Identified
LEAD
SILVER
ZINC
Agency Info Table
Information
Agency: BLM
Region District: BUTTE
Ranger District:
Forest Service Tract:
Watershed Code: 10020001
Forest or Resource Area: DILLON
Owner: B
Impact:
Report: Quote from Geach, 1972....."The H & S mine is at the center of sec. 9, T. 11 S., R. 13 W., at an altitude of approximately 7,400 feet on a low hill overlooking the site of the former mining camp of Chinatown. The properties consist of several unpatented claims held by Ben Davis of Dillon. The workings are easily accessible by means of several interconnecting mine roads leading off from the main dirt road up Jeff Davis Gulch. The mine is situated along a northwest-trending contact between gneiss and intrusive volcanic rock. As exposed in the underground workings, the gray granite gneiss ranges from predominantly massive with hardly discernible foliation to well foliated. A few layers of biotite schist and coarsely crystalline marble were also observed in the mine workings. The intrusive volcanic rocks are feldspathic and range from light-gray and tan felsite to porphyry that contains altered phenocrysts of feldspar in a dark siliceous groundmass. In the lower mine workings, the volcanic rocks in contact with the gneiss are brecciated, the breccia zones attaining widths of 100 feet. Most of the breccia fragments are felsite, but some are gneiss and calcite. Some of the breccia is recemented by chalcedonic silica and locally contains cubes of galena and sparse finely disseminated pyrite in the breccia matrix. Most of the ore is oxidized and contains various amounts of lead minerals. A characteristic feature is the red earthy hematite generally associated with the ore and staining the country rock near the deposits. Grains of hematite are also disseminated in the altered gneiss. Hematite in the ore probably results from oxidation of pyrite, whereas the hematite in the gneiss most likely results from alteration of ferromagnesian minerals. The different kinds of ore include earthy oxidized lead minerals and hematite breccia deposits at the contact between the gneiss and volcanic rock, volcanic rock breccias cemented by chalcedonic silica and galena, jasperoid replacements in coarse-grained calcite beds, and narrow veins in gneiss that contain abundant black manganese oxides and some galena. The principal workings at the mine are two main adit levels, one about 162 feet above the other, and some surface cuts, and shallow shafts. On the upper adit level, the underground workings total about 500 feet and explore mineralized zones localized along both walls of an elongate northwest-trending plug or dike of light-gray felsite. At its narrowest point where it is exposed along the walls of a crosscut, the plug is about 25 feet thick, but it thickens abruptly on each side of the crosscut. The southwest contact of the plug with the gneiss has been explored over a length of 100 feet. Several small stopes are situated along the contact. Remnants of ore left on the walls of the stopes are predominantly black manganese oxides containing some galena. The largest stope is 25 feet long, and ore has been stoped overhead and below the sill. From the end of these workings a crosscut about 45 feet long through felsite has exposed a bed of coarse-grained marble replaced by jasper in a zone 9 feet wide. Both the bed and the jasper zone trend N. 15 degrees E., and dip 52 degrees NW. A chip sample across the zone assayed no lead, 0.40 percent zinc, 0.90 ounce silver, and 0.005 ounce gold per ton. At the northeast end of the adit level, a 5-foot breccia zone consisting of altered country rock, jasper and earthy hematite is exposed. The zone has been pocketed by small chimney-like stopes. A chip sample across the zone assayed 1.10 percent lead, 0.90 percent zinc, 0.60 ounce silver, and 0.001 ounce per ton gold. The underground workings on the lower level aggregate about 1,365 feet and have been driven mostly along the southwest contact of the same igneous rock that is exposed in the upper adit level. The contact is brecciated and has been explored for more than 500 feet in a northwest-direction. The plug has been penetrated by several crosscuts, one of which is 180 feet in length and still in felsite. Near the beginning of this 180-foot crosscut, a northwest-trending mineralized breccia zone impregnated with red hematite is exposed. A chip sample across the zone assayed no lead, 0.30 percent zinc, 0.10 ounce silver, and only a trace of gold per ton. At a distance of 360 feet northwest of the 180-foot crosscut, a short crosscut of about 25 feet long has exposed disseminated galena in a breccia of tan felsite. The workings at the north-west end of the adit level exposed a north-west trending breccia zone stained by earthy red iron oxides. A former lessee of the property reported that a small sample taken here assayed about 4 percent lead. Only a small quanity of ore has been stoped from the lower adit level and it was mined from a stope about 10 feet high and 10 feet long in which 1/4-inch stringers of galena cut gneiss. Total recorded production from the property is 1,293 tons, which yielded 728,908 pounds of lead, 14,977 pounds of zinc, 700 pounds of copper, 11,182 ounces of silver, and 42 ounces of gold." Note: there are two underground plan maps of the workings (one of the upper adit, one of the lower adit) included in this publication.
Screening Criteria Table
Information
Mill Tailings: N
Adit Discharge: N
Metal Leaching: N
Water Erosion: N
Residence: N
Hazardous Materials: N
Open Adit: Y
Visit: Y
Comments: TWO OPEN ADITS; ONE OPEN SHALLOW SHAFT; ONE CAVED SHALLOW SHAFT.
Rank Table
Information
Investigator: A. ENGLISH
Date: 10/29/1996
Photos Available?:
Access:
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Number of Surface Water Intake(s) observed within 15 miles downstream:
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Sensitive Environments within 2 miles of Site or 15 miles Downstream:
Population within 0-0.25 miles:
Population within 0.25-0.5 miles:
Population within 0.5-1 miles:
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Public Interest:

End of report. Retrieved 4/30/2024 4:06:09 PM.

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