The NICO cobalt-gold-bismuth and Sue-Dianne copper-silver deposits of the Mazenod Lake area, Northwest Territories, are currently being drill-delineated by Fortune Minerals Limited. They are the only known significant Canadian examples of the Proterozoic iron oxide-hosted polymetallic class, more commonly referred to as hydrothermal iron oxide copper-gold deposits. NICO and Sue-Dianne are located in the southern part of the Great Bear magmatic zone, the central tectonic subdivision of the Bear Structural Province. It is a post-collisional plutonic terrane with related continental volcanic rocks dating from 1867 Ma and culminating with the emplacement of A-type rapikivi granite plutons at approximately 1856 Ma. Iron oxide occurrences are widely distributed within the Great Bear magmatic zone, ranging from Salobo-type magnetite-rich schists and ironstones in receptive basement rocks to Kiruna-type magnetite-apatite-rich veins and Olympic Dam-type sulphidized magnetite-hematite breccias in overlying volcanic rocks. NICO is hosted in iron- and potassium-altered, brecciated basement sedimentary rocks at and beneath the volcanic unconformity, showing similarities to the Salobo-type. The host "black rock" amphibole-magnetite-biotite schists and ironstones are capped by potassium feldspar-magnetite "red rock" felsite. In contrast, Sue-Dianne shows the essential characteristics of Olympic Dam-type ores, with mineralization hosted within a well-zoned diatreme breccia complex crosscutting a rotated ash flow tuff succession above the unconformity. At both NICO and Sue-Dianne, ongoing detailed paragenetic studies demonstrate that early, reduced, high-temperature mineral assemblages are overprinted by late, oxidative, low-temperature assemblages. These together with stratigraphic relationships, indicate fluid mixing at shallow crustal levels was important in deposit formation. Proximity of the NICO and Sue-Dianne deposits to subvolcanic porphyries, rapakivi granite and various other phases of the Marian River Batholith, together with geochronology and mineralogy studies, suggest they are all genetically related. The occurrence of diverse iron oxide deposit types within the Great Bear magmatic zone, makes this region favourable for exploration and for the study of the Proterozoic iron oxide class as a whole.

1. Gold Deposit Types: An Overview

Precambrian Gold Deposits

2 Metallogeny of the Neoarchean Malartic Gold Camp, Québec, Canada

3. Gold Deposits of the World-Class TimminsPorcupine Camp, Abitibi Greenstone Belt, Canada

4. Hemlo Gold System, Superior Province, Canada

5. The Low-Grade, Neoproterozoic, Vein-Style, Carbonaceous Phyllite-Hosted Paracatu Gold Deposit, Minas Gerais, Brazil

6. The Super-Giant, High Grade, Paleoproterozoic Metasedimentary Rock- and Shear Vein-Hosted Obuasi (Ashanti) gold deposit, Ghana, West Africa

7. Paleoproterozoic Gold Deposits of the Loulo District, Western Mali

Геология, флюидные включения, минеральный и (S-O) изотопный состав Бадранского орогенного месторождения золота, Яно-Колымский пояс, Восточная Сибирь: влияние на рудогенез

The engineer’s job is to design and build structures that interact continuously with the soil and subsurface. The goal of this book is to give engineers an academic understanding of earth science and the basics needed to conduct engineering activity appropriate to the various environments that exist on our planet. The objective is to provide:
• The knowledge and ability to analyze the geological processes that create, deform, and weather rocks;
• An understanding of the principal types of rocks and unconsolidated materials and their properties;
• An illustration of how geological conditions affect engineering activities, and how they can simplify or complicate these activities;
• An appreciation of the richness of underground resources and an understanding of how to manage them, geared toward modern engineers seeking sustainable development in an interdisciplinary environment.