An analysis of the potential for deposits of critical minerals and elements in Maine presented here includes data and discussions for antimony, beryllium, cesium, chromium, cobalt, graphite, lithium, manganese, niobium, platinum group elements, rhenium, rare earth elements, tin, tantalum, tellurium, titanium, uranium, vanadium, tungsten, and zirconium. Deposits are divided into two groups based on geological settings and common ore-deposit terminology. One group consists of known deposits (sediment-hosted manganese, volcanogenic massive sulphide, porphyry copper-molybdenum, mafic- and ultramafic-hosted nickel-copper [-cobalt-platinum group elements], pegmatitic lithium-cesium-tantalum) that are in most cases relatively large, well-documented, and have been explored extensively in the past. The second, and much larger group of different minerals and elements, comprises small deposits, prospects, and occurrences that are minimally explored or unexplored. The qualitative assessment used in this study relies on three key criteria: (1) the presence of known deposits, prospects, or mineral occurrences; (2) favourable geologic settings for having certain deposit types based on current ore deposit models; and (3) geochemical anomalies in rocks or stream sediments, including panned concentrates. Among 20 different deposit types considered herein, a high resource potential is assigned only to three: (1) sediment-hosted manganese, (2) mafic- and ultramafic-hosted nickel-copper(-cobalt-platinum group elements), and (3) pegmatitic lithium-cesium-tantalum. Moderate potential is assigned to 11 other deposit types, including: (1) porphyry copper-molybdenum (-rhenium, selenium, tellurium, bismuth, platinum group elements); (2) chromium in ophiolites; (3) platinum group elements in ophiolitic ultramafic rocks; (4) granite-hosted uranium-thorium; (5) tin in granitic plutons and veins; (6) niobium, tantalum, and rare earth elements in alkaline intrusions; (7) tungsten and bismuth in polymetallic veins; (8) vanadium in black shales; (9) antimony in orogenic veins and replacements; (10) tellurium in epithermal deposits; and (11) uranium in peat.
Dallas, Texas 75206··=c~~~· THIS IS A PREPJ<. IN'r --.-, SUB.;rEqT TO CORRECTION This paper was prepared for presentation at the Second Annual Offshore Technology Conference to be held in Houston, Tex,.., Apri122-24, 1970. Permission to copy is 'restricted to an abstract of not mare than 300 ·w6rds. ,illustrations may not be copiea.~Such use of an abstract should conta in conspicuous ffcknowledgment of where ?-nd b;Y whomthe paper is pre sented. ABSTRACT Callahan Mining Corporation is currently mining copper and zinc ore from an open pit mine on the edge of. Peliobscot·Bay in Marne.The open pit occupies an area once largely covered by a salt water pond. The mining operation utilizes conventional mining and milling techniqu·es and" in this respect perhaps could not be consid'ered a true marine mining operation. However, many obstacles had to be overcome due to the proximity of the ocean before the mine could be lnought into production. Problems with which inland mines do not have to contend are faced daily. These include effluent control, marine mud stability, salt water encroachment, reclamation, and exploration.The ore deI:>osit~sa stratiform massive sulfide body in early Paleo2ioic volcanics. The principal ore minerals are sphalerite and chalcopyrite with minor galena. Associated minerals include chlorite, talc, and carbonate.
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