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Black Pine Mine (Combination Mine; Black Pine tailings; Black Pine dump), Black Pine Ridge, John Long Mts, Philipsburg District (Flint Creek District), Granite Co., Montana, USA

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Latitude & Longitude (WGS84): 46° 26' 52'' North , 113° 21' 56'' West
Latitude & Longitude (decimal): 46.4477777778, -113.365555556

A former Ag-Au-Cu-Pb-Zn-Sb mine located in secs. 7, 8, 9, 16, 17 & 18, T8N, R14W, MPM. 6.2 km (3.9 miles) E of Black Pine Ridge (coordinates of record), along the South Fork Lower Willow Creek (approximately 14.5 km NW of Philipsburg), on patented mining claims within National Forest land. Owned & operated by the Inspiration Resources Corp. (100.00%), New York (1983) (Inspiration Consolidated Copper Co. is 50% controlled by Hudson Bay Mining and Smelting Co., Ltd., Toronto, Canada). Owned & operated by ASARCO (American Smelting and Refining Co.) (100.00%), New York (1990). MRDS database stated accuracy for this location is 100 meters.

The mine complex is approximately 14 km NW of Philipsburg. The property is accessible year round. The property is made up of 57 patented mining claims and 12 patented millsites containing approximately 1,027 acres and approximately 127 unpatented claims (updated May, 1997).

Mine chronology of significant events: 1882 - discovered; 1885 - few tons of ore put through the Hope Mill in Philipsburg; 1887 - combination mining and milling company purchased holdings of the Black Pine Mining Company; 1888 - combination mill built; 1888-1897 - operated continuously until low Ag prices and mined out oxides closed the mine; 1937 - shut down; 1974 - mine reopened; 1985 - (January) mine shut down; 1986 - (March) mine shut down; 1987 - (May) Inspiration reopens the mine; 1988 - mine closed because of low Ag prices.

ASARCO LLC purchased mine in 1990 and operated intermittently until 2000. Asarco mined high grade silica ore with various oxide minerals from the Tim Smith Vein for use as flux at the Asarco East Helena Smelter. Asarco deeded property to the Montana Custodial Trust in 2009.

Mineralization is a polymetallic deposit (Mineral occurrence model information: Model code 85; USGS model code 22c; Deposit model name ; Polymetallic veins; Mark3 model number 46), hosted in Neoproterozoic rocks of the Missoula Group (quartzite), and rocks of the Precambrian Spokane Formation (red shale). The ore body is fissure vein, tabular, strikes N30W and dips 25S at a thickness of 1.2 meters, a width of 1,070 meters, and a length of 1,070 meters, over an area of 162 HA. The primary mode of origin was hydrothermal. Primary ore control was bedding. Degree of wallrock alteration is unknown. The deposit is comprised of 4 fissure veins in quartzite. The Combination vein was the main producer. It is 0.5 to 4 feet wide, explored 1,900 feet along strike and 2,200 feet downdip. Its strike length may be GT 5,500 feet. The vein is cut and offset by a system of normal strike faults. The vein follows the bedding plane of the quartzite nearly everywhere. Little work was done on the Upper, Tim Smith, and Onyx veins. All 4 veins are similar. Controls for ore emplacement included northerly-striking sedimentary horizons. Local alteration included oxidation. Local rocks include rocks of the Missoula group.

Local geologic structures include 2 systems of faulting on the surface. Oner set strikes ESE and dips N; and the second set strikes ESE and dips S. Granodiorite outcrops 1 mile N of the mine.

workings include surface and underground openings and operations. There are 8 vertical shafts, 3 tunnels, drifts, inclines, and crosscuts (1906). All surface openings are closed except the Lewis shaft and Combination adit. 10,732 feet of bulldozing. The Combination vein was developed 2,400 feet down dip and 3,300 feet along strike (Alder, 1974). Flotation Mill.

Production statistics: Year: 1897; Period: 1885-1897: 62,199,999 grams of Ag.
[1888-1897 - Production was 2,135,000 ounces of Ag, and 1,411 ounces of Au (Anon, 1963) ($1,496,862.00 - period values).

Year: 1989; Period: 1885-1989: Ore mined: 1,339,000 metric tons.

Production history details: Ag: 174,863,770 grams; Au: 93,310 grams; Cu: 4,843,459 metric tons; Pb: 117,934 metric tons; Zn: 12,247 metric tons.

Resource/reserves data: Type: In-situ; Estimate year: 1997: Total resources: 1,180,000 metric tons ore (USGS OFR 2004-1038). Silver: 192.000000 grams/metric ton (1997).

Note: "The boleite attributed to the Black Pine mine actually came from the bricks of the Bi-Metallic Mill (Red Mill) in Philipsburg, Montana and are a reaction of the lime from the mortar in the bricks with the copper and silver left from the milling, smelter process. These specimens were found in the 50's or 60's and made their way into collections as boleite with the location as Black Pine, Montana." (Brent Thorne information)

Mineral List

76 valid minerals. 3 (TL) - type locality of valid minerals.

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Emmons, W. H., and Calkins, F. C. (1913), Geology and Ore Deposits of the Philipsberg Quadrangle, Montana, USGS Professional Paper 78: 252-255.

Volin, M.E., Roby, R.N., and Cole, J.W. (1952), Investigation of the Combination Silver-Tungsten Mine, U.S. Bureau of Mines Report of Investigation 4914.

Cole, J. W. (1955), Combination Mine: DMEA Defense Contract, 81-82.-E209, 20 pp.

Walker, D.D. (1960), Tungsten Resources of Montana: Deposits of the Philipsberg Batholith, Granite and Deer Lodge Counties: U.S. Bureau of Mines.

Walker, D.D. (1960), Tungsten Resources of Montana: Deposits of the Philipsburg Batholith: U.S. Bureau of Mines, Report of Investigation 5612: 2, 6, 8-13.

Prinz, W.C. (1967), Geology and Ore Deposits of the Philipsburg District Granite County, Montana; USGS Bulletin 1237, 66 P.?

Engineering and Mining Journal (1975), E/MJ International Directory of Mining and Mineral Processing Operations: Engineering and Mining Journal, Mining Informational Systems, McGraw-Hill: 155.

Engineering and Mining Journal (1976), Trackless Mining on a Small Scale, E/MJ, September 1976: 98.

Krohn, D. H., and Weist, M. M. (1977), Principal Information on Montana Mines, Montana Bureau of Mines and Geology Special Publication 75: 57.

Mining Congress Journal (1980), (March): 12.

Engineering and Mining Journal (1982), 45 Top U.S. Silver Mines (June, 1982): 15.

World Mining (1982), (September): 67.

Rocks & Minerals (1985): 60: 294.

Montana Bureau of Mines and Geology (1991), Bulletin 129.

Waisman D. (1992) Minerals of the Black Pine Mine, Granite County, Montana Mineralogical Record: 23(6): 477-483.

Ford, Eugene (1994), Personal communication to John Dagenais, re: XRD results March & April, 1994 (arsentsumebite).

"Black Pine Mine, Granite County, Montana" (1996), sent to MMAS by the Troy Unit Manager on 12/96.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10245537.

Mills, S. J., L. A. Groat and U. Kolitsch (2008): Te, Sb and W mineralization at the Black Pine mine, Montana. Poster, 18th Annual V. M. Goldschmidt Conference, Vancouver, Canada, July 13-18, 2008, abstract in Geochim. Cosmochim. Acta 72, Special Supplement 12S, A632.

Mills, S. J., Kampf, A. R., Raudsepp, M. & Poirier, G. (2009), New Fe-bearing members of the olivenite group from the Black Pine mine, Montana, Geological Society of America Abstracts with Programs: 41(7): 100.

Mills, S. J., Kolitsch, U., Miyawaki, R., Groat, L. A. & Poirier, G. (2009) Joëlbruggerite, Pb3Zn3(Sb5+,Te6+)As2O13(OH,O), the Sb5+ analogue of dugganite, from the Black Pine mine, Montana, American Mineralogist: 94(7): 1012–1017.

Mills, S. J., Kampf, A. R., Kolitsch, U., Housley, R. M. & Raudsepp, M. (2010), The crystal chemistry and crystal structure of kuksite, Pb3Zn3Te6+P2O14, and a note on the crystal structure of yafsoanite, (Ca,Pb)3Zn(TeO6)2. American Mineralogist: 95(7): 933–938.

Mills, S. J., Kampf, A. R., Poirier, G., Raudsepp, M. & Steele, I.M. (2010), Auriacusite, Fe3+Cu2+AsO4O, the first M3+ member of the olivenite group, from the Black Pine mine, Montana, USA. Mineralogy and Petrology: 99: 113–120. doi: 10.1007/s00710-009-0089-7.

Gobla, M. J. (2012) Montana Mineral Locality Index. Rocks and Minerals 87: 208-240.

Jensen, Martin and Tony Nikischer (2012), Some notes on the mineralogy of the Black Pine Mine, Granite County, Montana. Mineral News: 28(6): 1-10.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0300390005.

McLaughlin, Dan, Operation of an Optical Ore-sorting System, Mining Congress Journal: 26.

Montana Bureau of Mines and Geology, Directory of Mining Enterprises for 1974-75, Bulletin 95: 8.

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