四儿沟金矿床地质特征及找矿标志浅析

四儿沟金矿属于构造蚀变岩型金矿。含矿地层为中泥盆统西汉水组,矿化产出褶皱构造伴生的层间裂隙带及共生断裂带内。矿床位于区域重要的金异常带中,金矿的形成与区域岩浆活动有一定成因关系。已圈定9个金矿体,长度110~1180 m,真厚度1.90~6.06 m,平均品位1.18×10-6~6.04×10-6,工程控制斜深达608 m。金矿物主要为银金矿,金的成色为748.45%。金的粒度较粗。由此认为,本类金矿的主要控矿因素为碎裂构造,硅化、黄(褐)铁矿化、碳酸盐化是重要的找矿标志。

Geographical Feature and the Indicator for Deposit of Gold Deposit in Siergou

The gold deposit of Siergou belongs to gold deposit of the tectonic altered rock type .The ore-bearing stratum was formated in the Western Hanshui group of the middle Devonian system , mineralized by the interlayer fracture zone and the symbiotic fault zone associated with the fold structure .The deposit is located in the significant gold anomaly zone , and the formation of gold deposit is related to the regional magmatic activity .Nine gold ore bodies have been selected , with the length of 110M to 1180M, true thickness of 1.90M to 6.06M, and the average degree of 1.18-6.04（＆#215;10-6）, and the engi-neering control inclined depth of 608M.Gold deposits are mainly formed by electrum , the percentage of gold is 748.45%. The granularity of gold is relatively low .Therefore, the main ore-controlling factors is cataclastic structure , and silicifica-tion.Mineralization of yellow （brown） iron, and carbonatization is the most important indicator for deposit prospecting .