Very little metallic mineral development has occurred in the Crazy Mountain mining district in eastern Park County. As with other similar districts with little mineralization, the Crazy Mountain district serves to separate other more developed districts. It is likely the district is better known for its more recent coal industry than for historic mining. A large coal field extends east from the Crazy Mountains into Sweetgrass County (Stone 1909).
The Crazy Mountains are an anticlinal dome system with significant fractures caused by continuing uplift. Intrusive diorites and gabbros associated with shonkinites characterize the mountain belt. Alkaline rocks form a marginal zone of intrusion about a central stock of sub-alkaline rocks which invade upturned Eocene sediments (Balk 1936).
BOUNDARIES OF THE DISTRICT
Neither Sahinen (1935) nor Lyden (1948) place the district. Figure 1 shows the district as defined by the AMRB (1994) for administrative purposes.
HISTORIES OF SELECTED MINES
No historic mines appear in the mining literature.
Abandoned Mine Reclamation Bureau (AMRB)
1994 Mining districts of Montana. Maps 1:100,000 and Map #94-NRIS-129. Compiled and edited by Joel Chavez. Prepared by Montana State Library Natural Resource Information System (NRIS) for Montana Department of State Lands. Helena
1936 "Structure Elements of Domes." American Association of Petroleum Geologists Bulletin 20(1):51-67.
Lyden, Charles J.
1948 "The Gold Placers of Montana",
Montana Bureau of Mines and Geology Memoir 26
. Montana School of Mines, Butte.
Sahinen, Uuno M.
1935 "Mining Districts of Montana", Thesis, Montana School of Mines, Butte.
Stone, Ralph Walter
1909 "Coal Near the Crazy Mountains, Montana."
U.S.G.S. Bulletin 341