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

Sites Table
AIM Id Name Alternate Name District County
GR003491 HIDDEN LAKE MINE RED LION GRANITE
MRDS AMLI MILS Latitude Longitude Datum
W007431 20-006 300390406 46.2317 -113.1992
Township Range Section QSection UTM Northing UTM Easting UTM Zone UTM Datum
06N 13W 35 BCBD 5121920 330422 12
Average Elevation Elev Units Land Owner 250K Quad 100K Quad 24K Quad
F BUTTE PHILIPSBURG SILVER LAKE
Property Type Update Date Who Updated
LODE 6/13/1996 DMT
Commodities Table
Commodities Identified
COPPER
GOLD
SILVER
Agency Info Table
Information
Agency: NF
Region District: R1
Ranger District: PHILIPSBURG
Forest Service Tract:
Watershed Code: 17010201
Forest or Resource Area: DEERLODGE
Owner: P
Impact: L
Report: Hidden Lake Mine A caved adit and a caved shaft associated with 2,100 feet of workings (Elliott and others, 1992) spread over a vertical distance of 400-500 feet mark the site of the Hidden Lake Mine. A N47E striking, steeply dipping sheeted zone containing quartz and pyrite was mined (Earll, 1972). Host rock is a klippe of Mount Shields quartzite that was thrust over Paleozoic sedimentary rocks. The thrust may have had a part in localizing the distribution of ore not only at the Hidden Lake Mine, but across the entire Red Lion district. Between 1933 and 1942, 100,000 tons of ore with an average gold content of 0.2 oz/ton was produced. The soft, partially oxidized vein material made milling and extraction easy, but with depth the ore became harder and operations less efficient, contributing to the closure of the mine. The potential for remaining ore and the distribution of gold showings over a wide area surrounding the mine have interested several exploration companies in the past decade. Numerous drill holes were completed, but no results have been released. Hidden Lake Tailings Below the Hidden Lake Mine, tailings are eroding during storm events from a large area of of national forest land. The Hidden Lake was a cyanide mill which processed oxidized ore, and the tailings therefore contain mostly quartz and iron oxide. About 100,000 tons are present at an average grade of <0.006 oz/ton gold, 0.40 oz/ton silver, 0.022% copper, 0.020% lead, and 0.088% zinc. New vegetation is evident on the tailings.
Assay Table
Information
Sample Id: JGHL-1
Material Type: MI
Sample Method: COMP
Comments:
Screening Criteria Table
Information
Mill Tailings: Y
Adit Discharge: N
Metal Leaching: N
Water Erosion: N
Residence: N
Hazardous Materials: N
Open Adit: N
Visit: Y
Comments: LONN; 8/92
Soil Chemistry Table
Sample Id Lab Id Description Project Comments
FHLD10H 92S1043 HIDDEN LAKE TAILINGS (CLARK FORK RPT) DLFORST

End of report. Retrieved 5/3/2024 1:12:32 PM.

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