Control the distribution of placer gold is strictly controlled by the gold bearing geological bodies

“含金地质体”是砂金形成的物质基础，并直接影响其分布。所谓“含金地质体”主要有岩金矿化体，伴生金矿床（点）及含金丰度值很高的地层与岩体。

Geological gold is the material basis of formation of gold, and directly influence its distribution. The so-called "gold bearing geological body" mainly has the gold ore body, the associated gold deposit (point) and the gold bearing high value are very high.

实际资料表明：

Actual data show:

(1)多数砂金矿的分布与岩金矿产地密切相关 但也有少数限于其他地质条件，虽有岩金矿分布不一定都能形成砂金矿床。如小秦岭是岩金成矿区，限于地貌等条件未能形成砂金矿床。相反，在大兴安岭北部及阿尔泰等地区是砂金密布区，目前仅发现一些原生金矿点或矿化点。

(1) most of the distribution of sand gold deposit is closely related to the origin of the rock gold deposit, but there are few other geological conditions, although the distribution of rock gold deposit is not always able to form a sand gold deposit. Such as the small Qinling Mountains is a gold ore deposit, limited to the conditions of the formation of sand gold deposit, etc.. On the contrary, in the north of Greater Khingan Range and Altai area is densely covered area of placer gold, currently only found some primary gold mineralization point or points.

(2)砂金成矿区大都分布于含金丰度较高的古老基底地层及大面积侵入岩的剥蚀区

(2) the old basement strata and a large area of placer gold metallogenic zone mostly distributed in the gold abundance of higher intrusive rocks eroded areas

如湖南的湘江、资水、沅江、汨罗江，江西修水、昌江、信江、新安江水系的砂金主要分布于江南古陆的板溪群、冷家溪群地层出露的地区；川西北地区的砂金矿其补给源主要来自前震旦系碧口群、志留系茂县群及中上三叠统地层，及其中的原生金矿点；两广交界一带的砂金主要分布于加里东褶皱基底震旦系与前寒武系地层中；大小兴安岭一带的砂金主要分布于海西期岩浆岩大面积出露区。

Such as Hunan, Xiangjiang, Yuanjiang, the Miluo river water resources, Jiangxi Province, Changjiang River, Xin River, Xin'An river river placer gold is mainly distributed in the Jiangnan Banxi, LENGJIAXI strata exposed area; sand gold deposit in Northwest Sichuan recharge source mainly comes from the pre Sinian Bikou Silurian in Maoxian and in the three group of Triassic strata, and the gold point; Guangdong and Guangxi in the vicinity of the junction of placer gold is mainly distributed in the Caledonian fold basement of Sinian and Cambrian strata in Xingan before; the size of the ridge area of placer gold is mainly distributed in the Hercynian magmatite large area of exposed areas.

(3)大多数砂金矿床的物质来源具有多源性 例如，金盆砂金矿的物质来源主要是白垩系下统含金砾岩层，其次为二道洼群中的分散含金石英脉、侏罗系含金砾岩等多源补给。又如珲春河两岸大面积分布的中酸性岩浆岩中的含金石英脉及含金破碎蚀变带周围的伴生金矿及第三纪含金砾岩是砂金的补给来源。

(3) the material source of most gold placer with multi-source such as material source of gold placer gold basin is mainly the lower Cretaceous Banket, followed by two Erdaowa group in dispersed auriferous quartz veins, auriferous conglomerate in multi supply. And as in acidic magmatite large area distribution of Hunchun River in the gold bearing quartz veins and altered fracture zone around the associated gold and three gold bearing gravel rock is tertiary source of placer gold supply.