REV11497

• Permit No: M1990047
• IBM Index Class Name: Revision
• Doc Date: 10/16/2003
• Doc Name: Application
• From: Fremont County
• To: DMG
• Type & Sequence: AM1
• Media Type: D
• Archive: No

EXI3IBTT C--MILTING PLAN
This application addresses the amendment of Permit M-90-047 for increase in
permitted acreage from 2.7 to 6.1 acres. This site has been actively mined for the past
several years with app. 2.5 acres of presently disturbed ground. Bedrock consists of a
well weathered granite with zones of aheration of the granite to fate grained clay
minerals, providing for a natural binder £or gravel materials. This variety of road
material tends to stay more stable on the roadway while m;n;m;~ing dust and grader
mtinienance. This pit will serve Fremont County for the next ten years or rrwre
depending upon production rates.
The Quagmire Pit will be the sole source of road materials fora 25 mile stretch of County
Road 12 over Stony Face Mountain and possibly 10 miles or more of County Road 16 in
the vicinity of Waugh Mountain. At full capacity, the mine is expected to produce
25,000 tons/year of gravel. Mine equipment will consist of a bulldozer and front-end
loader for removal and stockpiling of the gravel, and haul trucks for transportation of the
road material. Contract crushing and screening will be utilized as needed. Due to the
simplicity of the mining operation, no permanent structures are planned, nor are any
utilities or service facilities needed. Bulldozer ripping and puslvng of the weathered
granite bedrock will produce the rocky feed to contract crushing and screening. Drilling
and blasting is not planned for this operation. Natural slopes found on the site are 2.5:1,
H:V. Final grading will resuh in 2.0:1 slopes with limited areas along the western edge
of the site that may be sloped to 1.75;1. This slightly steeper slope may be found along
the transition from disturbed ground to undisturbed land along the western permit
boundary and in areas where more resistant bedrock knobs may be left exposed on the
surface. When possible, slope areas wit}rin the mined area will be reduced to a grade no
steeper than 2.5:1, H: V and stabilized via contour Tilling to minimize erosion of newly
exposed material. After mining, whatever topsoi3 available during mining operations
will be placed on the flatter areas of the mined land aad the slopes of the disturbed area
will be contour tilled prior to seeding with a native rnixhrre of grasses and shrubs.
The bedrock consists ofpre-Cambrian aged macrocrystalline granite, red to pink in color.
The feldspar rich igneous rock displays ample quartz and biotite content with zones of
altered mineralogy to chlorite and other clay minerals of fine grained texture. The site is
a mountain upland slope of weathered bedrock covered by a thin soil horizon vegetated
with native cactus, grasses, forbes, and trees. The soil cover has been truncated in the
drainage areas by erosion and the surface is punctuated with boulders and rounded knobs
of granite bedrock more resistant to weathering. The mine plan wnsists of removing 15-
20 feet of the surface, exposing additional bedrock and fines materials. Final depth of
excavation will be determined by the hardness of bedrock limiting bulldozer ripping of
the material. When a soil horizon can be salvaged, the material will be stockpiled at the
southern end of the site for redistribution over the site prior to revegetation. It is
estimated that about 40% of the site will have salvageable soils of no more thaw six
inches in thickness. Bedrock exposed displays various degrees of weathering and
alteration, with oxidized zones of granite to red, yellow, and bluish green clay nunerals.
No significant occurrence of metal sulfides were found on site.
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