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TitleChapter 8: Geology of the Lapa Orogenic Gold Deposit
AuthorMercier-Langevin, P; Simard, M; Dubuc, R; Côté, J; Doucet, P; Daigneault, R; Gaboury, D
SourceReviews in Economic Geology vol. 19, 2017 p. 247-262
LinksAbstract - Résumé
Alt SeriesEarth Sciences Sector, Contribution Series 20140089
PublisherSociety of Economic Geologists
Mediapaper; on-line; digital
File formatpdf
AreaCadillac; Malarctic; Amos
Lat/Long WENS -78.5000 -78.0000 48.2500 48.0000
Subjectsmetallic minerals; economic geology; gold; gold, native; faults; fault zones; mineral assemblages; alteration; biotite; sericite; actinolite; hornblende; metamorphism, retrograde; metamorphism, prograde; Cadillac mining camp; Piché Group ultramafic
Illustrationslocation maps; tables; photographs
ProgramTargeted Geoscience Initiative (TGI-4) Gold Ore Systems
Released2017 01 01
AbstractThe Lapa deposit is located in the Cadillac mining camp in the southern part of the Archean Abitibi greenstone belt. The Cadillac mining camp is known for its numerous, but relatively small, greenstone-hosted (mesothermal or orogenic) vein-type gold deposits. These gold deposits are spatially associated with the Larder Lake - Cadillac fault zone (Fig.1-refs), an E-W-striking crustal fault that separates the Abitibi greenstone belt (north) from the Pontiac Subprovince.
The Lapa deposit (~1.15 Moz Au; Table 1), and to some extent all the Cadillac camp deposits, are hosted in shear zones within the Piché Group or very near its contacts with the Cadillac (north) and Pontiac (south) groups. Although relatively common in that part of the Southern Abitibi greenstone belt, orogenic gold deposits related to crustal-scale faults are generally preferentially located along second- and third-order structures rather than within the first-order structures as it is the case at Lapa. In addition to its ¿unusual¿ position in a major break, the Lapa deposit is characterized by specific attributes related to its host rocks, alteration assemblages, ore styles and tectono-metamorphic evolution.
The objective of this visit at Lapa is to illustrate the geological setting and main alteration and mineralization attributes of a first order fault-hosted orogenic gold deposit that is characterized by distinct characteristics that differentiate it from other major orogenic gold deposits of the southern Abitibi greenstone belt and other Archean terrains.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. Work done at Lapa deposit and the Cadillac mining camp is integrated in the study of other major gold deposits located along the Cadillac fault that are studied through the Targeted Geoscientific Initiative Program aiming at developing more efficient tools in exploration for gold deposits. The characterization of the Lapa deposit tackles the problematic of auriferous deposits associated with major, crustal-scale faults. This document presents a summary of the main characteristics of the Lapa deposit, in order to disseminate the data and make the data available to all, including through a field excursion.

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