gold lateritic saprolitic deposits in nigeria

Lateritic clay deposits are often cheaply or freely found in any market centre in Nigeria and in most states of the country It occurs mostly in tropical African countries and in Nigeria it can be found in vast quantities in Abia and Oyo State

DESCRIPTION Au disseminated in laterite and saprolite that developed under conditions of tropical weathering fig 32 over a wide variety of bedrock types but distal to known bedrock gold deposits Figure 32 Idealized cross section of lateritesaprolite Au deposit

Table 1 shows template of the proposed mining methods for ASGM operators in Nigeria Table 1 Mining Method Selection Template for ASGM Operators in Nigeria SN Type of Deposit Proposed Mining Method 1 Alluvial elluvial colluvial deposits Strip mining 2 Weathered gold lodes phyllitic quartzitic and lateritic materials Terrace mining 3

The deposits are mostly small 15 million metric tons and of low grade 1550 gmetric ton but can be exploited because of the relative ease of mining and treatment The lateritic gold deposits are more or less flatlying zones contiguous with the ferruginous horizon and underlying mottled zone of the weathering profile

Mesothermal gold Au deposits also labelled Orogenic gold are a distinctive class of mineral deposit that has been the source for much of world gold production The ores are widely recognized in both Phanerozoic mobile belts and older cratonic blocks ie the Lake Victoria Goldfields located within the Tanzania Craton

Mining is the extraction of valuable minerals or other geological materials from the earth The geological survey agency of Nigeria and the ministry of mines and steel development have reported the occurrence of more than 34 minerals in over 450 locations spread across the entire country which are in various stages of development

The Geology of Las Cristinas Gold Deposit KM 88 However not until very recently in the 1980s that mining in the district was apparently reactivated by several thousands of itinerant miners garimpeiros which discovered and surficially mined numerous gold rich lateritic and saprolitic deposits

bedrock 5 Also the lateritic profiles usually consist of three main units differing in their organization as well as in their lateral continuity the saprolitic lower unit the glebularnodular medial unit and the loose upper unit In the Ity gold area Ivory Coast the Au contents of the laterite profiles are variable 8

Brief description This report summarizes integrates and discusses the results of over three years of research The research had the objectives of a obtaining a better understanding of the nature and genesis of the regolith and the lateritic and saprolitic gold deposits contained within it and b determining characteristics useful in exploration for further such deposits and for primary

The gold deposit in Osun state is worth about 5 billion in today’s price according to a research finding by Olugbenga Akindeji Okunlola a professor of geology at the University of Ibadan

The Volta Grande project includes two lateritic and saprolitic gold type deposits Ouro Verde and Grota Seca A two phased approach is planned first with a processing capacity of 35Mta of ore and then increasing to 7Mta by year 3 Conventional open pit mining methods will be used

Table 1 shows template of the proposed mining methods for ASGM operators in Nigeria Table 1 Mining Method Selection Template for ASGM Operators in Nigeria SN Type of Deposit Proposed Mining Method 1 Alluvial elluvial colluvial deposits Strip mining 2 Weathered gold lodes phyllitic quartzitic and lateritic materials Terrace mining 3

The deposits are mostly small 15 million metric tons and of low grade 1550 gmetric ton but can be exploited because of the relative ease of mining and treatment The lateritic gold deposits are more or less flatlying zones contiguous with the ferruginous horizon and underlying mottled zone of the weathering profile

The Artisanal and Smallscale Gold Mining ASGM sector in Nigeria is in a deplorable state characterised by the use of inadequate mining and processing methods and manual tools by the local

However not until very recently in the 1980s that mining in the district was apparently reactivated by several thousands of itinerant miners garimpeiros which discovered and surficially mined numerous goldrich lateritic and saprolitic deposits

Barrick Resolute Mining Anglo Gold Ashanti and Hummingbird Resources 2 57 59 2 218 Saprolitic greywacke 62 63 1 376 Foliated chlorite altered greywacke saprock NTAC177 10 12 2 063 Lateritic duricrust 14 15 1 057 Highly weathered upper saprolite Greywacke 18 19 1 117 ditto

Mesothermal gold Au deposits also labelled Orogenic gold are a distinctive class of mineral deposit that has been the source for much of world gold production The ores are widely recognized in both Phanerozoic mobile belts and older cratonic blocks ie the Lake Victoria Goldfields located within the Tanzania Craton

Mining is the extraction of valuable minerals or other geological materials from the earth The geological survey agency of Nigeria and the ministry of mines and steel development have reported the occurrence of more than 34 minerals in over 450 locations spread across the entire country which are in various stages of development

Jan 01 2019 · Both ferricrete and lateritic residuum may host exploitable secondary gold deposits typically small 500000 ounces and of low grade 1–5 gt Au The lateritic residuum deposits overlie weathered and fresh primary mineralization whereas ferricrete deposits overlie uneconomic primary mieralization or barren saprolite and bedrock

In French Guiana three types of Proterozoic gold deposits can be recognized goldbearing tourmalinites goldbearing conglomerates and mesothermal ore deposits and used as

Mineable reserves of lateritic ore are located at Boddington Westonia and Gibson toward the southwest of the Yilgarn Block Turbiditehosted gold deposits •••••••••••••••• and the physical nature of saprolitic bedrock makes it accessible to low cost open cut mining The gold is free

Nov 01 2001 · Primary and saprolitic Au mineralization is indicated by a broad Au anomaly 100 to 1000 ppb in the soils and lateritic residuum and by high concentrations of W 5 to 40 ppm Sb 7 to 16 ppm and As 10–200 ppm High K contents corresponding to resistant muscovite give surface expression to the alteration zone