Ore Characteristics and Gold Occurrence Status of PL7184 Gold Deposit in Tanzania
Received date: 2019-01-18
Revised date: 2019-05-13
Online published: 2019-12-24
The greenstone belt around Victoria Lake in Northwest Tanzania is one of the famous gold metallogenic belts in the world，about 90% of the gold deposits are related to the BIF type gold deposits，but its overall research level is low，especially lack of researching on ore characteristics，gold-bearing properties，gold minerals and occurrence of gold，etc.Based on the study of ore characteristics and gold occurrence state of the greenstone belt gold deposit around Victoria Lake in Tanzania，the genesis of the deposit was comprehensively analyzed to guide ore processing and metallurgical process.By means of field observation，optical thin section identification，electron microscopy and electron probe analysis，the ore characteristics and occurrence of gold in PL7184 gold deposit have been systematically studied and analyzed.The results show that the PL7184 gold deposit belongs to altered rock type gold deposit controlled by ductile shear zone.It is a subclass of greenstone belt type gold deposit.Its gold orebodies mainly occur in shear fracture zone between banded iron-bearing formation rock and acid volcanic sedimentary rock.The gold ores are divided into four natural types in this area，they are dense disseminated pyrrhotite，sparse disseminated pyrrhotite，veinlet pyrrhotitand star-bearing point pyrrhotite.Among them，the dense disseminated gold pyrrhotite ore has the richest gold content，accompanied by strong pyrrhotitization，silicification and arsenopyrite alteration.The primary ore mineral symbiotic assemblages in this area are mainly silver-gold deposit+natural gold（small amount）+pyrite+quartz+chlorite+arsenopyrite+pyrrhotite.Some of the marenatural gold+pyrite+quartz+chlorite，natural gold（small amount）+pyrite+quartz.The content of Au in gold minerals is 65.63% to 85.36%，with an average of 74.77%.The content of Ag is 12.25% to 33.79%，with an average of 24.27%.The ratio of w(Ag)/w(Au) is 0.14 to 0.51，mainly concentrated in 0.25 to 0.34.The main types are silver-gold deposits，with a small amount of natural gold.The fineness of silver-gold deposits is 656.3‰ to 791.8‰，with an average of 734.5‰，and the fineness of natural gold is relatively high，the highest is 853.6‰.The occurrence of gold minerals is mainly intergranular gold，followed by encapsulated gold and fissure gold.Meanwhile，the particle size of gold minerals is mainly medium-fine grains，and the particle size is 0.01 mm to 0.07 mm in more.
Kechuan ZHANG , Qingwei LUO , Aiwen YI , Deyu QIN , Cheng QUAN , Jibing YANG . Ore Characteristics and Gold Occurrence Status of PL7184 Gold Deposit in Tanzania[J]. Gold Science and Technology, 2019 , 27(6) : 826 -834 . DOI: 10.11872/j.issn.1005-2518.2019.06.826
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