The U.S. mineral property evaluation patchwork of regulations and standards

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Mots clés : Valuation;Mineral properties;Regulations;Standards
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Texte
Sommaire: Mineral exploration properties are those
on which an economically viable mineral
deposit has not yet been discovered. Such
properties are bought, sold, optioned and joint
ventured on the basis of their perceived potential for the existence and discovery of a viable mineral deposit. The intrinsic value of an exploration property is therefore based on the exploration potential. One measure of the
exploration potential is the amount that can be
justified to spend on exploration for a viable
depo...
Publication: CIM Bulletin
Auteur(s): W.E. Roscoe
Mots clés: Valuation, Mineral resources, Exploration properties, Appraised value method
Numéro: 1059
Volume: 95
Année: 2002
Texte
Sommaire: This paper deals with the stability investigations carried out at the XIVth seam of Jitpur colliery. The study was conducted to investigate the possible causes of roof cavity formation and face spalling at the middle slice face of block-3 longwall panel and to suggest remedial measures. The instrumentation and monitoring work was carried out in the panel over a period of nine months. On the basis of observations, it was found that if the maximum face span was reduced from the existing 4.8 m...
Publication: CIM Bulletin
Auteur(s): A.K. Singh, R. Singh, M. Sarkar, P.K. Mandal, D. Sharma
Mots clés: Stability, Slicing, Face spalling, Roof cavity formation, Extraction, Longwall mining
Numéro: 1059
Volume: 95
Année: 2002
Texte
Sommaire: A series of new, grease-based, solventfree
open gear lubricants were developed to
meet the demanding service requirements of
mining equipment. The use of these products
has resulted in better performance under conditions of temperature extremes and in terms of longer component lives. They have gained widespread acceptance within the mining communities for such applications as the lubrication of mining shovels, draglines and ball mills. These products are WHMIS non-controlled and are environme...
Publication: CIM Bulletin
Auteur(s): N. Samman, S.N. Lau
Mots clés: Mining, Open gear, Gear lubricant, Grease, Multi-service
Numéro: 1059
Volume: 95
Année: 2002
Texte
Sommaire: Coal shearers are one of the major
sources of dust and fines in underground coal
mines. Despite considerable research investigations, no comprehensive in situ investigations coupled with extensive laboratory studies on the effects of drum design on generation of dust and fines have been found. It may be for this reason that many major shearer drum manufacturers persistently employ a certain drum-lacing pattern on current coal shearers, which is believed to cause excessive dust and fines in...
Publication: CIM Bulletin
Auteur(s): O.Z. Hekimoglu, B. Tiryaki, M. Ayhan
Mots clés: Underground mining, Shearer drums, Dust, Fines, Coal mines, Tunnelling
Numéro: 1059
Volume: 95
Année: 2002
Texte
Sommaire: The use of liquid copper as a medium for
zinc extraction has been used in the Warner
Process as a method of processing zinc-lead
sulphide ore. The recovery of zinc metal is
based on the reaction: ZnS(s) + 2Cu(l) = Zn(g) + Cu2S(l) In this method, thermodynamic and phase equilibria investigations of the Cu2S-FeS-ZnS and Cu2S-PbS-ZnS systems are of importance and form the basis for the liquid sulphide phase which appears as a product and is used as a solvent in the Warner Process. Phase...
Publication: CIM Bulletin
Auteur(s): C.M. Nyamai, S. Surapunt, K. Itagaki
Mots clés: Extraction, Sulphide, Zinc, Liquid copper, Smelting
Numéro: 1059
Volume: 95
Année: 2002
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