興海縣銅鑫礦業有限公司成立于2014年8月，注冊資金1000萬元，經營范圍：礦山開采、加工與銷售，礦產品技術研發、咨詢和服務。

銅鑫礦業隸屬洛陽開元礦業集團有限公司，是青海省海南藏族自治州政府招商引資入駐的重點企業。公司主要礦山為瑪溫根銀（金）礦。

瑪溫根銀（金）礦位于青海省東部共和盆地西南緣一帶，地處興海縣與共和縣交界處，礦區距塘格木鎮五大隊西約5公里，倒邦公路從礦區南部通過，經鐵蓋鄉可直達礦區，礦區距海南州約100公里，距西寧市約250公里，行政區劃屬海南州。探礦權面積8.76k㎡，海拔3400—3890米。礦區內已發現礦體6條，在鄂拉山多金屬成礦帶上，初步估算礦石儲量在100萬噸以上，礦石中富含：金、銀、銅、鉛、鋅、錫、鎘等元素，已具備大型礦山開采規模，潛在著巨大開采價值。

Xinghai County Tongxin Mining Co., Ltd., founded in August, 2014, has 10 million yuan registered capital. Its main business is the exploitation, processing and sale for mine, the research and development, consultation and services of mine products.

Xinghai County Tongxin Mining Co., Ltd., belonging to Luoyang Kaiyuan Mining Group Co., Ltd., is a key enterprise in attracting investment for Tibetan Autonomous Prefecture Government of Hainan, Qinghai. The main mine of company is the Ma Wengen Silver (Gold) Mine.

The Ma Wengen Silver (Gold) Mine is located in the southwest edge of Gonghe Basin on the east of Qinghai, and lies in the junction of Xinghai County and Gonghe County. From the diggings to Xining City is about 250 kilometers, to Hainan Prefecture is about 100 kilometers, and to Tram 5 in Tang Gemu Town is about 5 kilometers. Daobang highway passes through the south of diggings, and going by the Tiegai Township can directly get to the diggings. The administrative division belongs to Hainan Prefecture. The right of prospecting is 8.76 square kilometers in area, and it has 3400——3890 meters’ altitude. Six ore bodies have been found. In the polymetallic belt of Elashan, we preliminary estimates this belt has more than 1 million ton ore reserves. There are gold, silver, copper, lead, zinc, tin and cadmium in the ore reserves, therefore, it hides large exploitation value, and has a lager scale of mining.