Element Dispersion by the Wallrock Alteration of Daehyun Gold-silver Deposit

Abstract

The Daehyun gold-silver deposit consists of two hydrothermal quartz veins that fill NE-trending fractures in the Cambro-Ordovician calcitic marble. I have sampled wallrock, hydrothermaly-altered rock and gold-silver ore vein to study the element dispersion and element gain/loss during wallrock alteration. The hydrothermal alteration doesn't remarkably recognized at this deposit and consists of mainly calcite, dolomite, quartz and minor epidote. The ore minerals composed of arsenopyrite, pyrrhotite, pyrite, sphalerite, stannite, chalcopyrite, galena, electrum, native bismuth and silver-bearing mineral. Based on analyzed data, the chemical composition of wallrock consists of mainly SiO 2 , CaO, CO 2 with amounts of Al 2 O 3 , Fe 2 O 3 (T) and MgO. The contents of SiO 2 , Fe 2 O 3 (T), MgO, CaO and CO 2 vary significantly with distance from ore vein. The element dispersion doesn't remarkably recognized during wallrock alteration and only occurs near the ore vein margin because of physical and chemical properties of wallrock. Remarkable gain elements during wallrock alteration are Fe 2 O 3 (T), total S, Ag, As, Bi, Cd, Cu, Ni, Pb, Sb, Sn, W and Zn. Remarkable loss elements are SiO 2 , MnO, MgO, CaO. CO 2 and Sr. Therefore, Our result may be used when geochemical exploration carry out at deposits hosted calcitic marble in the Hwanggangri metallogenic district.

Spectral Responses of As and Pb Contamination in Tailings of a Hydrothermal Ore Deposit: A Case Study of Samgwang Mine, South Korea

“…Quartz, calcite, dolomite, chlorite, and alkali feldspar are reported as gangue minerals. Major hydrothermal alteration minerals were found in the study site; they include quartz, pyrite, sericite, epidote, chlorite, clays, and carbonate minerals [51].…”

“…Calcite originated from calcite vein, being a gangue mineral [50,51]. Albite and muscovite could be regarded as representative rock-forming minerals from the host rock [50,51]. Furthermore, phlogopite, dolomite, and clay minerals (clinochlore, illite, montmorillonite, and vermiculite) were found in all the samples, reported as major hydrothermal alteration minerals [50,51] (Table 2).…”

“…In the results, quartz, muscovite, phlogopite (subgroup of biotite), clinochlore (subgroup of chlorite), illite, and montmorillonite were detected in most of the samples (Table 2). Quartz was the most dominant mineral crushed during the mining process from gangue and/or rock-forming minerals from quartz vein and host rock in the study area [50,51] (Table 2). Calcite originated from calcite vein, being a gangue mineral [50,51].…”

“…Quartz was the most dominant mineral crushed during the mining process from gangue and/or rock-forming minerals from quartz vein and host rock in the study area [50,51] (Table 2). Calcite originated from calcite vein, being a gangue mineral [50,51]. Albite and muscovite could be regarded as representative rock-forming minerals from the host rock [50,51].…”

Revised Geology and Geological Structures of the Northeastern Chungnam Basin in the Southwestern Korean Peninsula

“…The Chungnam Basin and adjacent area (Fig. 1) have been attracting considerable interest due to the presence of coal fields and mineral deposits (e.g., Chungnam coalfield and Samgwang gold-silver deposit: Chun et al 1987Chun et al , 1990So and Shelton, 1987;So et al, 1988;Yoo et al, 2002Yoo et al, , 2009Yoo et al, , 2010. The Chungnam basin records evidence of two-phase subsidences related to the Late Triassic to Early Jurassic post-collisional (viz., Nampo Group) and the Early to Middle Jurassic intra-arc (viz., Oseosan Volcanic Complex) processes (Choi et al, 1987;Kim and Kim, 1998;Kim and Lee, 2015;Park et al, 2018Park et al, , 2019Lee et al, 2021).…”