Barites occurence

Barite is abundant and widespread in Kuroko deposits. However, it is concentrated especially in the upper horizons (black ore and barite ore), increasing upwards within the black ore. Such a trend is also observed frequently in the tetsusekiei, but rarely in the yellow ore. Barite occurs also as vein-fillings in the stockwork siliceous ore. 

Barite and anhydrite occur in the massive pyritic ores. Barite occurs frequently in the sphalerite-rich layers of the massive ores in the Chihara deposit (Kanehira, 1959). 

Barite occurs in abundance in Alaska, Arkansas, California, Georgia, Missouri, Nevada, and Tennessee as well as in Canada and Mexico. This substance was produced at 38 mines in seven U.S. states in 1973. Total U.S. production for 1973 was 1,104,000 tons, a figure which represented 23% of world production. Nevada supplied 50% of this total with Missouri ranking second in domestic production of barite ore. Domestic production levels for 1969 were much lower at 603,000 tons (Davis 1972). A list of barium production and processing facilities in the United States along with the production or processing volume for each are provided in Table 4-1. 

Barite occurs as scarce, large crystals (up to 2 mm) filling vugs and cracks and engulfing as well as replacing kaolinite and carbonate cements in dolocretes and calcretes (Fig. 14F). In the sandstones, barite occurs as a few poikilotopic and small crystals which cover, and thus postdate, chlorite rims around framework grains. 

Barite occurs in trace amounts as patchy poikilo-topic, grain-replacive cement associated with partially dissolved carbonate cement. Anhydrite cement forms < 1 vol% in the fine- to medium-grained sandstones that contain micritic carbonate intraclasts (calcretes/dolocretes), occurring in the upper part of... 

Sulfur occurs native in the vicinity of volcanos and hot springs. It is widely distributed in nature as iron pyrites, galena, sphalerite, cinnabar, stibnite, gypsum, epsom salts, celestite, barite, etc. 

Authigenic barium sulfate or barite [13462-86-7] is found in relatively high concentrations in sediments covering active diverging oceanic plate boundaries. It occurs as rounded masses containing up to 75% BaSO or as a dispersed constituent of the sediment. Its origins are uncertain, but it is likely that it is associated with hydrothermal actions. 

In its natural form, barium [7440-39-3] Ba, never occurs as the metal but is almost always found as the ore barite [13462-86-7] BaSO. More than 90% of all barium is actually used as the ore, albeit after preliminary beneftciation. The petroleum industry consumed 90% of the ore for oil- and gas-weU drilling duids (muds). The other 10% is used as filler and/or for extender uses and the manufacture of all other barium chemicals. Witherite, the only other significant natural barium ore, is not mined commercially (1). The quantity of U.S. barium chemicals produced in 1986 and 1987 is given in Table 1. 

Barite [13462-86-7], natural barium sulfate, BaSO, commonly known as barytes, and sometimes as heavy spar, tiU, or cawk, occurs in many geological environments in sedimentary, igneous, and metamorphic rocks. Commercial deposits are of three types vein and cavity filling deposits residual deposits and bedded deposits. Most commercial sources are replacement deposits in limestone, dolomitic sandstone, and shales, or residual deposits caused by differential weathering that result in lumps of barite enclosed in clay. Barite is widely distributed and has minable deposits in many countries. 

Heavy metals are present in drilled formation solids and in naturally occurring materials used as mud additives. The latter include barite, bentonite, lignite, and mica (sometimes used to stop mud losses downhole). There are background levels of heavy metals in trees that carry through into lignosulfonate made from them. 

Barium (eighteenth most abundant element) is also rather rare it occurs as the mineral barite, BaSCV... 

The principal minerals of Sr are strontionitc (SrCO,) and celesite (SrS04) those of Ba are barite (BaS04) and witherite (BaCO,). Strontionitc and barite are the usual sources of metallic Sr and Ba, respectively. Traces of both elements occur in nearly all limestones and dolomites and small amounts are usually present in natural limes. Furthermore, although neither element occurs as an independent silicate, traces of each may replace part of the Ca, Pb or K in compounds containing one or more of these elements. 

Electrum occurs mainly in the black ore zone dominantly composed of sphalerite, bornite, galena and barite. It is common in B sub-type such as the Ezuri and Fukazawa deposits. It occurs in brown compact black ore consisting of barite, galena. 

Quartz is abundant in siliceous ore, barite ore and tetsusekiei ore. Minor amounts of Mg-minerals (talc, Mg-chlorite) occur in sekko ore. Chlorite occurs in. sekko ore and it contains high amounts of Mg (Fig. 1.18). 

Kaolin minerals (kaolinite, dickite, nacrite), pyrophyllite and mica-rich mica/smec-tite mixed layer mineral occur as envelopes around barite-sulfide ore bodies in the footwall alteration zones of the Minamishiraoi and Inarizawa deposits, northern part of Japan (south Hokkaido) (Marumo, 1989). Marumo (1989) considered from the phase relation in Al203-Si02-H20 system that the hydrothermal alteration minerals in these deposits formed at relatively lower temperature and farther from the heat source than larger sulfide-sulfate deposits in the Hokuroku district. 

Sr/ Sr of barite from small Kuroko deposits (Iwami in San-in and Minamishi-raoi in Hokkaido) are lower (Yoneda, et al., 1993 Honma and Shuto, 1979 Farrell and Holland, 1983) than that from large Kuroko deposits in Hokuroku district. This indicates that a large seawater circulation did not occur in a small Kuroko mine area and that seawater circulation is important for the formation of Kuroko deposits. 

Quartz is abundant but barite is poor in the siliceous ore, though barite veinlets occur in this zone. 

Quartz coexisting with barite also occurs in the ferruginous and barite ores in Kuroko deposits. 

Barite is abundant in the massive strata-bound ore bodies (black and barite ores) in Kuroko deposits and occurs in the ferruginous chert ore in Kuroko deposits, and chimneys in active deposits at back-arc basins. 

Adularia is abundant in Au-Ag deposits, where it is commonly found with Au-Ag minerals only rarely does it occur in Pb-Zn and Cu deposits. Albite is very rare and is reported only from the Nebazawa Au-Ag deposits. Barite is a common gangue constituent in Pb-Zn-Mn deposits, especially those in the southwestern part of Hokkaido and the northern part of Honshu, where it is usually a late-stage mineral coexisting with carbonate and quartz but rarely with sulfide minerals. Other rare gangue minerals include fluorite, apatite, gypsum, bementite, rutile, and sphene, but they have not been studied. 

Occurrence of gangue minerals in both types of deposits is different. For example, Mn minerals (Mn carbonates, Mn silicates) occur abundantly in the Rendaiji, Yugashima, Yatani, and Todoroki epithermal Au-Ag vein-type deposits in the Green tuff region but not in the Non-Green tuff-type. values of barite from these deposits are high (-1-18%o... 

Minor amount of barite and ilmenite are also present in the ore. Previous studies conducted on this ore [10] indicated that a saleable-grade concentrate can be produced but at a very low niobium recovery (18-20%). Most of the niobium losses occur in the... 

Barium was discovered in 1808 by Sir Humphrey Davy. Its abundance in the earth s crust is about 0.0425% (425 mg/kg). The element also is found in sea water at trace concentration, 13 J,g/L. It occurs in the minerals barite or heavy spar (as sulfate) and witherite (as carbonate). 

Barium sulfate is widely distributed in nature and occurs as the mineral barite (also known as barytes or heavy spar). It often is associated with other metallic ores, such as fluorspar. Barites containing over 94% BaS04 can be processed economically. 

Barium sulfide occurs in the form of hlack ash, which is a gray to hlack impure product obtained from high temperature carbonaceous reduction of barite. It is the starting material in the manufacture of most barium compounds including barium chloride and barium carbonate. It is used in luminous paints for dehairing hides as a flame retardant and for generating H2S. 

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