WhatsApp)
OTHER EXPLORATION GUIDES: Strong structural control on veins and common occurrence of deposits in clusters can be used to locate new veins. ECONOMIC FACTORS TYPICAL GRADE AND TONNAGE : Individual vein systems range from several hundred to several million tonnes grading from 5 to 1500 g/t Ag, to 20% Pb and to 8% Zn.
Massive vein type Steeplydipping quartzgold veins occur in linear shear zones within slatey mudstone and sandstone. Veins are narrow but high grade. Average grade of probable mining blocks 2327 g/t using 100 g/t topcut (Uncut 42 g/t). Grade and width vary widely horizontally and vertically. Coarse visible gold in sulphide,
#0183;#32;Major gold volumes such as `Gold ''82'' (Foster, 1984), `Turbiditehosted Gold Deposits'' (Keppie et al., 1986) and `Gold ''86'' (Macdonald, 1986) lacked any mention of such a deposit type. However, since the Nesbitt et al. (1986) paper, the `mesothermal'' terminology has become wellentrenched in the literature.
Vein Gold Home gt; Explore by Theme gt; Gold in Nature gt; Two Types of Gold Deposits gt; Vein Gold About 500 million years ago, gold settled out of sea water into
Bonanza gold grades identified in some high sulphidation deposits may represent an evolution to a lower sulphidation style locally evident as epithermal quartz goldsilver (, direct shipping ore in the El Indio veins; Jannas et al., 1990, 2000, and the adjacent Viento veins, Corbett, unpubl.
The largest goldquartz vein deposit in British Columbia is the BralornePioneer which produced in excess of 117 800 kilograms of Au from ore with an average grade of g/t. ECONOMIC LIMITATIONS : These veins are usually less than 2m wide and therefore, only amenable to underground mining.
#0183;#32;Epithermal gold deposits are among the richest gold deposits in the world with some bonanza grade ore shoots containing more than 1000 g/t gold, or in other words, a kilogram of gold for every tonne of rock mined. Unfortunately, the tonnage of ore in epithermal veins is typically small compared with other types of lower grade gold deposits.
#0183;#32;Gradecontrol activities provide an important framework in which to develop geological understanding of the deposit: the critical feature of narrow gold veins is their strong geological controls.
Narrow Vein, High Grade Gold. The original source of gold deposits owes its formation to one of the unique properties of the mineral Gold. It does not like bonding with other elements. As a result, it basically forms as free gold wherever super heated, super pressurized liquids force their way into.
Robert, F., Poulsen,, and Dub#233;, B. G OLD DEPOSITS AND THEIR GEOLOGICAL CLASSIFICATION 211 Table 1: Commonly recognized types of lode gold deposits and their main geological attributes (contd.) Deposit Type Associated Alteration Metal Association Size amp; Grade of Deposits Selected References
Grade control in underground gold vein operations: the role of geological mapping and sampling, in Proceedings of the Seventh International Mining Geology Conference, (ed. S. C.
(2012). Grade control geological mapping in underground gold vein operations. Applied Earth Science: Vol. 121, uranium deposits and insitu leaching, pp. 96103.
Gold mineralisation occurs in veins, stockworks and breccia and as disseminations in the host rock. Grade is highly variable, typically with the very high grades occurring in the veins. Vein widths are often narrow, leading to highgrade, lowtonnage deposits over large lateral extents.
Metallurgical ContentGold Deposit Class #1Gold Deposit Class #2Gold Deposit Class #3Gold Deposit Class #4Gold Deposit Class #5Gold Deposit Class #6Gold Deposit Class #7Gold Deposit Class #8Gold Deposit Class #9Gold Deposit Class #10 Gold/Auriferous Deposits can be classified into types for which here is a List of 10 Types of Gold Deposits: Auriferous porphyry dykes, sills, and
the processes that control gold endowment of an orogenic terrane is to compare the nature of shear systems that are richly endowed with those that are not. The approximately 80kmlong Bardoc Tectonic Zone (BTZ, Fig. 1) is one such shear system that only hosts small deposits. It produced 100 tonnes of gold from more than 80 recent
These include arsenic, antimony, or mercury which may be enriched in the rocks adjacent to the gold ore, either within the vein structure or in adjacent country rocks, producing a quot;haloquot;. Grades of gold historically have been in the to g/tonne range with cutoff around g/tonne.
Epithermal gold deposits have size, geometry, and grade variations that can be and (3) the likely controls on grade (, the versely, structurall y controlle d lowsulfidatio n veintyp e .
#0183;#32;3. The geochemical behavior of gold in hydrothermal systems. The occurrence of gold mainly depends on temperature, pressure, pH values, Cl concentration, and fugacity of H 2 S in a hydrothermal system. Gold mostly occurs as AuCl 2 in a system with temperature higher than 400 #176;C (Gammons and WilliamsJones, 1997), and with decreasing temperature being the primary mechanism causing gold
WhatsApp)