subject: Primary Metallogenic Trait Of Antimony In Exploiting [print this page] Basic metallogenic trait of China"s antimony deposits are as follows: 1) Host strata and lithologic control.Except the Jurassic and the Cretaceous, all the strata in China ranging from the Presinian to the Quaternary have been found to contain commercial antimony deposits. But the discovered deposits and explored reserves are centered in the Devonian (in foreign countries they are mainly in the Silurian). The Devonian is the most important host strata in China, in which the discovered and explored deposits are many and large and have 64% of the country"s total explored antimony reserve. Examples are the Xikuangshan superlarge deposit (ore field) in Hunan, the Dachang superlarge Sn-Pb-Zn-Sb-polymetallic deposit in Guangxi, the Muli deposit in Yunnan and the Lejiawan deposit in Guangdong which are all distributed in the South China antimony belt; and the Gongguan deposit which lies in the Qinling Hg-Sb belt. Country rocks of the antimony deposits are diversified but mostly carbonates. These carbonate rocks contain 29% of China"s total number of antimony deposits and 64% of itstotal Major antimony localities in China Note: In the table of the Chinese edition of this book there are 35 antimony localities. But here only large deposits (Sb reserve 100,000 t) and medium-sized deposits (Sb reserve=10,000~100,000 t) are listed. Their numbers are the same as in the Chinese edition and consistent with those in Fig. 3.16.1. explored reserves. Less important are low-grade metamorphic rocks, of which the predominant are slates. The metamorphic rocks contain 25% of China"s total number of antimony deposits and 20% of its total explored reserves. There are also siliceous rocks (mainly sandstones), which contain 13% of China"s total number of antimony deposits. 2) Metallogenic time.According to the Notes to the Metallogenic Map of Endogenetic Metal Deposits in China (1987), the antimony deposits of Yanshanian age in the country occupy 60% of the country"s total major deposits, those derived from multi-epoch metallogeny make up 38%, and those of other epochs are few. 3) Distribution of metallogenic belts.There are mainly 4 antimony metallogenic belts in China which are connected respecitvely to 4 belts of the same kind in the world: a) South China belt.This is the most important antimony belt in China and also an important part of the circum-Pacific antimony belt. The known antimony deposits (occurrences) in this belt account for 85.5% of the country"s total number of antimony deposits (occurrences) and 83.1% of its total antimony reserves. b) Western Yunnan Tibet belt.It extends westward and connects to the Mediterranean antimony belt. The known antimony deposits (occurrences) in this belt constitute 2.4% of the country"s total number of antimony deposits (occurrences) and 0.3% of its total antimony reserve. c) Qinling-Kunlunshan belt.It extends towards the west and connects to the central Asia antimony belt. The known antimony deposits (occurrences) in this belt make up 9.7% of the country"s total number of antimony deposits (occurrences) and 16.3% of its total antimony reserve. This is an important antimony belt ascertained in the recent 10 years. d) Changbaishan-Yinshan-Tianshan belt.This is a newly discovered belt extending westward and connecting to the Transbaikal antimony belt. The belt contains 3.4% of the country"s total number of antimony deposits (occurrences) and 0.3% of its total antimony reserve.As the professional manufacturer of complete sets of mining machinery, such as belt conveyor,sand washing machine, Henan Hongxing is always doing the best in products and service. On the basis of the ore-bearing sequence, metallogenic setting, material composition, and physical and chemical conditions of the mineralization, China"s antimony deposits can be divided into 7 types: 1) Carbonate type.Deposits of this type, occurring in strata of carbonate sequence, are formed by reworking of the ore-forming material by hot brine. The material itself is derived mainly from source bed of the ore. Most of the deposits are large and one or two are superlarge. Typical of these are the Xikuangshan antimony deposit (ore field) in Hunan and the Muli antimony deposit in Yunnan. 2) Clastic type.The ore-bearing sequence of clastic-type deposits consists of marine clastic (or clastic of littoral local depressions and continental margins), including mudstones, siltstones and fine-grained sandstones, often intercalated with much impure carbonate rocks. The deposits are large to medium-sized. Typical of them is the Banpo antimony deposit in Guizhou. 3) Low-grade metamorphic type.The ore-bearing sequence of this type of deposits is composed of fine clastics with volcano-sedimentary rocks. The deposits are mostly small to medium-sized, with a few being large. Typical of these are the Woxi and Longshan antimony deposits in Hunan, the Gongguan antimony deposit in Shaanxi and the Yawan antimony deposit in Gansu. 4) Marine volcanic type.In the ore-bearing sequence of this type of deposits, both volcanic and volcano-sedimentary rocks are well-developed. The deposits are large to medium-sized. Typical of these is the Qinglong antimony deposit in Guizhou. 5) Continental volcanic type.This is a new type of antimony deposits in China. Deposits of this type occur at the margins of volcanic fault basins of activated platform. The metallogeny is related to the rift-type volcanism of late Yanshanian-Himalayan time. The deposits are small to medium-sized, and the typical is the Baoshan antimony-gold deposit in Jiangxi. 6) Postmagmatic Sb-W type.The parent ore-forming rocks of this type of deposits are magmatic. Most of the deposits are closely related to the small shallow or ultrashallow rock bodies and veins of middle to late Yanshanian time. Based on their differences in metallogenic mode and temperature, deposits of this type can be divided into two subtypes: the hypo-mesothermal metasomatic filling and the meso-epithermal filling. The deposits are small to medium-sized. Typical of these is the Gaoguashan tungsten-antimony deposit in Hunan. 7) Exogenetic accumulative type.Deposits of this type are produced by the surface oxidation of primary antimony minerals into antimony ocher, valentinite, etc., which are weathered and eroded to form, together with native gold or cassiterite, a placer. Such deposits are mostly small in size, with one or two being medium-sized. Their ores are easily mined and dressed. These deposits are distributed chiefly in the Shanglin-Tianyang-Debao area of Guangxi.sand washing equipment:http://www.hx-crusher.com/sand_washer.html ore spiral classifier:http://www.hx-crusher.com/classifier.html
