The Cash porphyry copper-molybdenum deposit, Dawson Range, Yukon Territory

Abstract The Cash is one of the largest porphyry copper-molybdenum deposits found in Yukon to date. It is 80 km northwest of Car-macks, within the unglaciated portion of the Dawson Range, and is associated with the Big Creek fault, an important tectonic feature. Part of the mineralized zone is blanketed by up to 70 m of alluvial drift. The remainder is covered by a relatively thin residual soil layer. The mineralized zone, however, was not detected by conventional stream-sediment sampling because pathfinder elements, such as Cu and Mo, have not been geochemically dispersed into the main drainage system. The deposit was discovered by a combination of soil analysis and inspection of rock fragments from small pits.Twenty widely spaced, shallow drill holes have outlined an area over 2700 m long and 550 to over 1000 m wide that grades more than 0.1% copper equivalent (% CuE= % Cu + (5x% MoSJ). Two smaller zones grading over 0.4% copper equivalent occur within the larger area. The limits of the widest end of the deposit have not been delineated.The Cash deposit is fairly typical of high-level, calc-alkaline porphyry copper-molydenum occurrrences in the Canadian Cordillera (cf. CIM Special Volume 15) and is representative of most prospects in the Dawson Range. It is associated genetically with a subvolcanic complex of small, irregular stocks and dykes of feldspar porphyry and related breccias of Late Cretaceous age. Copper and molybdenum sulphides occur along fractures, in quartz veinlets and disseminated in feldspar porphyry and in older metasedimentary and intrusive rocks. Higher-grade zones of copper and molybdenum have associated potassic alteration. Phyllic alteration is, in part, superimposed on potassic alteration. Argillic alteration occurs locally.This paper describes the history of the discovery and the geochemical and geophysical characteristics, together with the regional geology, and the nature and distribution of the host rocks, hypogene mineralization and hydrothermal alteration.
Keywords: Cash deposit, Copper, Molybdenum, Dawson Range, Yukon, Porphyry deposits, Geochemical exploration, Soil analysis, Alteration.
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Summary: A test apparatus has been developed for obtaining the relations among confining stress, porosity and percolation rate for hydraulic sand backfills. The apparatus can also be used to evaluate internal drainage characteristics and the effects of partial saturation on percolation rates. The test apparatus, test procedures and typical test data are presented in this paper.
Publication: CIM Bulletin
Author(s): R.J. MITCHELL, J.D. SMITH
Keywords: Underground mining, Compression, Percolation, Tailings, Backfilling, Hydraulic mining.
Issue: 833
Volume: 74
Year: 1981
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Summary: All ten Canadian provinces have now tabled their 1981/82 budgets. Only the provinces of Ontario, Quebec and British Columbia made more than minor modifications to their tax structures, with both Ontario and Quebec imposing major tax increases. In the past year, the federal budget was also released in the spring. Not so this year: we have that to look forward to in the fall!This month, Tax Notes presents a brief summary of the more significant tax changes introduced at the provincial levels in...
Publication: CIM Bulletin
Author(s): ROBERT D. BROWN
Issue: 833
Volume: 74
Year: 1981
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Summary: A fast, reliable and accurate method for radium-226 determination in environmental water samples has been devised, using an alpha spectroscopic technique. The correlation between barium-133 and radium-226 in the barium-radium sulphate precipitation mechanism was studied and in the limited experimental recovery range, the coefficient of correlation was r = 0.986. A self-absorption study for various barium carrier concentrations was also undertaken to obtain the least broadening of alpha energy...
Publication: CIM Bulletin
Author(s): T.P. LIM, N.K. DAVE
Keywords: Radium, Analysis, Water, Spectroscopy, Environmental control, Barium, Precipitation, Ryan Lake, Nordic Lake.
Issue: 833
Volume: 74
Year: 1981
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Summary: To properly operate a mineral beneficiation plant it is often necessary to have systematic evaluations of the performances of apiece of machinery, of one of the processes or of the plant as a whole. The state of a process can be described from a collection of data: flow-rate values, particle-size distributions and chemical compositions of the various streams of the circuit studied.However, the obtained raw data are generally redundant and inconsistent from a material balance viewpoint, due to...
Publication: CIM Bulletin
Author(s): D. HODOUIN, T. KASONGO, E. KOUAME, M.D. EVERELL
Keywords: BILMAT, Mineral processing, Material balances, Algorithms, Comminution, Desliming, Flotation, Computers, Cyclones, Grinding circuits, Niobec.
Issue: 833
Volume: 74
Year: 1981
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Summary: The rates, J, at which materials emit radon are of interest in studies of the sources of radon in mines, buildings, soils overburden and other places where it may indicate the location of ore or be a health hazard. Here J values were determined by measuring the radon concentrations by means of scintillation counters or alpha-particle track detectors in chambers in which specimens were sealed. Errors in the measurements due to leakage from the chambers, lack of secular equilibrium in the decay...
Publication: CIM Bulletin
Author(s): R.H. McCORKELL, G. ARCHAMBAULT, M.P. BRAMELD
Keywords: Radon, Emanation rates, Scintillation counters, Track detectors, Uranium, Exploration, Environmental control.
Issue: 833
Volume: 74
Year: 1981
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Summary: The behaviour of minerals during flotation of a fine-grained pyrite-rich base metal ore was investigated by studying the feeds, concentrate and tailings from every flotation cell in the mill of Brunswick Mining and Smelting Corp. Ltd., Bathurst, New Brunswick. The samples were analyzed for Zn, Pb, Cu, Fe, Ag, Sb, Sn, Bi, In, Hg, Mo and As. Mass balances were computed and recoveries of all metals from each cell, from each circuit and from the mill were calculated. The percentages of sphalerite...
Publication: CIM Bulletin
Author(s): WILLIAM PETRUK, J.R. SCHNARR
Keywords: Mineral processing, Concentrators, Brunswick Mining and Smelting, Mass balances, Screen analyses, Zinc, Lead, Copper, Sphalerite, Galena, Chalcopyrite, Milling, Flotation.
Issue: 833
Volume: 74
Year: 1981
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Summary: Noranda's Lyon Lake property in the Sturgeon Lake area of Northwestern Ontario was staked by Mattagami Lake Mines Limited in May 1969 to cover airborne Input anomalies. Subsequent ground geophysical and diamond drilling programs resulted in the discovery of the Boundary Extension, Lake and Creek ore zones. As of December 31, 1978, ore reserves were estimated at 3,945,000 tons assaying 6.53 per cent Zn, 1.24 per cent Cu, 0.63 per cent Pb, 3.42 oz/ton Ag and 0.010 oz/ton Au. These deposits are...
Publication: CIM Bulletin
Author(s): J.D. HARVEY, J.B. HINZER
Keywords: Lyon Lake deposits, Sturgeon Lake area, Zinc, Copper, Exploration, Geophysical exploration, Alteration, Ore deposits.
Issue: 833
Volume: 74
Year: 1981
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