CHARLES M. RUSSELL WILDLIFE REFUGE, MONTANA.

A mineral survey of the Charles M. Russell Wildlife Refuge in Montana indicates that parts of the area have demonstrated resources of low-rank coal and bentonite in areas of substantiated potential and all of the area is assigned a probable resource potential for oil and gas because it is underlain by sedimentary strata known to contain hydrocarbons in other areas. Potential hydrocarbon accumulations, including both oil and gas, are difficult to delineate because of the absence of subsurface control points within the refuge. Geophysical surveys and directional drilling along the fringes of the wildlife refuge would aid in refining resource estimates for organic fuels. 1 ref.