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REP33384
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Last modified
8/25/2016 12:09:48 AM
Creation date
11/27/2007 6:29:49 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977342
IBM Index Class Name
Report
Doc Name
PROBABILISTIC SEISMIC HAZARD ANALYSIS OF HENDERSON TAILING DAM NORTH CENTRAL COLO
Media Type
D
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The advent of World War II again resulted in a high demand <br />for moly, and the U.S. Government bought the mine from Vana- <br />dium Corporation and turned it over to Molybdenum Corporation <br />to operate. The mine was again shut down at the end of World <br />War II. <br />During all pre-AMAX operations, outside access to the upper <br />portals of the mine on Red Mountain was gained either by a burro <br />trail (Map ",) „r an overhead !ram Syc(am„_ An access driii and <br />i.100-fuui service raise was develcped prier fo P,MAX operations. <br />AMAX took an option on the property in 1961 and paid two <br />million dollars for it after determining the extent of the ore body <br />inside Red Mountain. AMAX then spent about 30 million dollars <br />in further exploration and development and went into production <br />in 1967. <br />By the end of 1974, the ore body was depleted, and the <br />reclamation and stabilization of the Urad Valley began. <br />Ri collar to thr? mina at Climax. Colorado. the objective of the <br />Urad operation was the extraction of molybdenite ore and the <br />production of molybdenum disulfide (MoS._) concentrate. The con- <br />centrate was shipped to Langeloth, Pennsylvania where it was <br />converted to various molybdenum (cooly) products as required by <br />each industrial user of the metal. <br />There are many uses for cooly, some of which are: t) alloys for <br />high-strength, heat-resistant steel and abrasion and corrosion- <br />resistant steels, 2) high-stress lubricants. 3i pigments. 4i catalysts. <br />and 5) as an essential micronutrient constituent of fertilizer, <br />The Urad ore body contained approximately 14 million tons <br />of ore at an average grade of about 0.33 percent MoS_. The mining <br />and milling rate was about 5.000 tors of ora'day, which repre- <br />sented about five percent of the free world production of molyb- <br />denum during the years AMAX operated the mine. At the time of <br />shutdown, the mine had produced about 48.5 million pounds of <br />pure moly. <br />Tha remaining aooroximate 99.7 percent of the 14 million <br />Tons of ore was predominantly composed of silica antl was trans- <br />ported by water slurry to two tailing deposition areas. The water <br />was then decanted from the surface of the tailing areas and <br />recycled back through an industrial mill water circuit. <br />The Urad Mine used a modified block-caving system of under- <br />ground mining in removing the ore from the deposit located inside <br />Red Mountain. The ore processing facilities were conventional <br />crushing and flotation milling circuits. <br />Employment at the mine was as high as 279 people, most of <br />whom were miners, with the remainder serving various support <br />positions, such as miii aiienuaiiis, niecilnitiCS, eiC. Production ran <br />24 hours/day, seven days a week. <br />The reclamation of the Urad Valley has been a continuing <br />objective of AMAX. II beyan with awell-planned, environmentally <br />concerned mining operation in the valley when AMAX re-opened <br />the mine. A concentrated effort at the total stabilization and <br />reclamation of the valley will begin during the summer of 1975. <br />The following is a comprehensive plan for the reclamation, stabili- <br />zation, and revegetation (all interrelated terms) of ecologically <br />disturbed areas in the valley. <br />4 <br />
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