Laserfiche WebLink
<br /> <br />the East Branch of Ute Creek, Grand County, Colorado. The mill site <br />>~~ <br />(Figure 2-4) is approximately 22 miles south of Parshall, Colorado, <br />just off Grand County Road No. 3. Also present in the vicinity are <br />the mill-water and potable-water reservoirs, mill-water storage tanks, <br />gravel pits, gravel storage area, tailing deposition area with seep- <br />water entrapment canal and runnoff diversion canals. <br />Conventional crushing and semi-autogenous milling circuits <br />(Figure 2-5) are used to reduce the size of the ore and liberate <br />economic minerals for collection and concentration by flotation. <br />Approximately 8 to 9 pounds of molybdenum disulfide (MoS2) concentrate <br />are extracted from each ton of ore. The remaining 1,991 pounds is <br />waste in the form of fine silica sand which is transported by gravity <br />in a water slurry to a tailing deposition area north of the mill site. <br /> All water used to transport the tailing is decanted from the surface <br /> and returned to the mill for reuse via a completely closed-loop <br />industrial water circuit. <br />The concentrate is trucked via Ute Pass to Kremmlinq, <br />Colorado, where it is shipped by train. Most of the concentrate goes <br />to AMAX's Fort Madison, Iowa, molybdenum conversion facility. <br />AMAX was presented the Industrial Development <br />Research Council's Distinguished Service <br />Environmental Planning Award for 1975 "by <br />virtue of significant achievements in the <br />harmonizing of economic development with <br />sound conservation principles" for its <br />environmental efforts during construction <br />of the Fort Madison facility. <br /> <br />2-'9 <br />