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Implications of rock mineralogy and texture on the feasibility of in situ leach mining of Mn-bearing iron formations of central Minnesota, U.S.A.

Authors
saini Eidukat-B; Maroza-D; Blake-R; Adamson-N
Source
Appl Geochem 1993 Jan; 8(1):37-49
NIOSHTIC No.
10003360
Abstract
The U.S. Bureau of Mines is investigating the feasibility of extracting Mn using in situ leach mining methods. Among the deposits being examined are the iron formations of the Cuyuna range, Minnesota, which contain high-tonnage, low grade deposits of manganese oxides. Manganese minerals identified include pyrolusite, cryptomelane-hollandite, manganite, braunite and lithiophorite. Ore reactivities, as measured by batch leaching tests using aqueous SO2, are compared to theoretical estimates of the leaching behavior of individual manganese minerals based on kinetic and thermodynamic evaluations. Experimental results in some cases show opposite trends to those predicted by theoretical estimates. In batch leaching tests of Cuyuna Range ores, texture was shown to be of greater importance, than thermodynamic reactivity in determining amenability to leaching. Predicting the practical potential for recovery of Mn by in situ leaching must involve identification of the effects of texture (massive, fractured-host, or interstitial) in addition to ore mineral reactivity.
Keywords
Mining-industry; In-situ-mining; Manganese-compounds; Mineral-processing; Mineral-deposits
CODEN
APPGEY
Publication Date
19930101
Document Type
Journal Article
Fiscal Year
1993
NTIS Accession No.
NTIS Price
Identifying No.
OP 16-93
Issue of Publication
1
ISSN
0883-2927
NIOSH Division
TCRC
Source Name
Applied Geochemistry
State
MN
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