The new H-W orebody— cutoff grades and mine economics

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Mots clés : Economics;Orebody;Capital costs;Algorithm
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Texte
Sommaire: No Canadian or his family is likely to escape the effects of proposals for pension reform tabled on October 9, 1986 by Finance Minster Michael Wilson. New tax rules are proposed for Registered Retirement Savings Plans (RRSPs), company pensions, and other forms of retirement plans. Draft legislation is expected to be released in the first half of 1987.
Publication: CIM Bulletin
Auteur(s): ROBERT B. PARSONS
Numéro: 899
Volume: 80
Année: 1987
Texte
Sommaire: Two analysis tools which have been applied to problems in industrial flotation processes are the application of kinetics and detailed mineralogical or liberation data, both on a size-by-size basis. This paper describes practical examples of the application of kinetics to examination of the entrainment recovery mechanism, the retardation of valuable minerals at the commencement of flotation sections and the resolution of problems related to valuable species with reduced rate constants at the...
Publication: CIM Bulletin
Auteur(s): N.W. JOHNSON
Mots clés: Kinetics, Liberation, Flotation process, Mineralogy, Sphalerite, Sulphide gangue minerals.
Numéro: 899
Volume: 80
Année: 1987
Texte
Sommaire: Aspects of materials, design and operation of suspension equipment is dealt with, hazard, fatigue and special metallurgical properties of certain steels to resist are described, as is the effect of temperature in service modifying the properties of some steels to resist stress concentration and propagation of cracks.
The influence of steady impact and fatigue loading and its results are described. Control of manufacture including nondestructive testing is outlined and acceptance parameters...
Publication: CIM Bulletin
Auteur(s): E.A. DAVIES, T.T. JONES
Mots clés: Equipment, Maintenance, Suspension gears, Fatigue loading, Mechanical strength, Non-destructive testing, Quality control, Heat treatment.
Numéro: 899
Volume: 80
Année: 1987
Texte
Sommaire: Those who submit competing proposals for projects seek to present senior management with complete and fully supported material that will not fail under questioning. Hopefully, misleading notions and omissions will have been minimized and there will have been testing of the assumptions regarding the economic, social and political environments.
A capital project evaluation team can do management and itself a service by including a sound approach to the impact of inflation (and its twin problem,...
Publication: CIM Bulletin
Auteur(s): L.D. SMITH
Mots clés: Economics, Inflation, Production.
Numéro: 899
Volume: 80
Année: 1987
Texte
Sommaire: At most operating mines, geostatistical ore reserve estimation methods have been implemented by head office or consulting groups. With recent advances in small computer technology it is now possible for a remotely-located mine department to independently implement a geostatistical package.
This paper describes the evolution of geostatistical routines to calculate the mineral inventory for porphyry type copper/ molybdenum or similar ore bodies. The problems encountered in down sizing the...
Publication: CIM Bulletin
Auteur(s): N.I. NORRISH, G.H. BLACKWELL
Mots clés: Mine planning, Geostatistics, Ore reserves, Mineral inventory, Kriging, Grade control.
Numéro: 899
Volume: 80
Année: 1987
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