China is one of the largest silver and other non-ferrous metals manufacturer and exporter on the globe. There are five huge silver mines, that is Lengshuikeng (江西冷水坑银矿), Tongbai (南阳市桐柏县桐柏银矿), Fenghuangshan (广西隆安凤凰山银矿), Siping (吉林四平银矿), Pingshang (福建龙岩坪上银矿), Following non-ferrous metal suppliers, esp for silver ingot, have been sourced but not inspected by STIN verification team in China, here is the list for your reference:
1. Henan Yuguang Gold and Lead Co., Ltd
  Product: lead ingot, gold and silver ingot, alloys
  Tel: 0391- 6699888
 
2. Jiangxi Copper Group Corporation 
  Product: copper ingot, gold and silver ingot, alloys
  Tel: 0701-3777070

3.Yunnan Copper Group Corporation 
  Product: copper ingot, gold and silver ingot, zinc ingot, alloys
  Tel: 0871- 63175096

4.Tongling Nonferrous Metals Group Corporation 
  Product: copper ingot, gold and silver ingot, alloys
  Tel: 0562-5860016  5860000 

5  Jiyuan Jinli Smelter Co., Ltd
  Product: lead ingot, zinc ingot, gold and silver ingot, alloys
  Tel: 0391-6891293

6. Hunan Shuikoushan Non-ferrous Group Co., Ltd
  Product: lead ingot, zinc ingot, copper ingot and silver ingot, alloys
  Tel: 0734-7582281

7. Hunan Yuteng Non-ferrous Metals Co., Ltd
  Product: lead ingot, sulphuric acid , gold and silver ingot, alloys
  Tel: 0735 -2791358

8. Yunnan Hongchi Xinzhe Holding Co., Ltd
  Product: lead ingot, zinc ingot, silver ingot, alloys
  Tel: 0874-8966752

9. Zhuzhou Smelter Group Co., Ltd
  Product: lead ingot, zinc ingot, silver ingot, alloys
  Tel: 0731-28391215

10. Henan Yuguang Gold and Lead Co., Ltd
  Product: lead ingot, gold and silver ingot, alloys
  Tel: 0391- 6699888

11. Zijin Mining Group Co., Ltd
  Product: gold ingot, copper and silver ingot, zinc ingot, alloys
  Tel: 0597-3833105  

12.Hechi Nanfang Non-ferrous Co., Ltd
  Product: lead ingot, sulphuric acid , gold and silver ingot, alloys
  Tel: 0778 -2290206

13.Shandong Zhaojin Group
  Product: gold and silver ingot, alloys
  Tel: 0535-8227500 
 
14.  China Tin Group Co., Ltd
  Product: tin ingot, lead ingot, silver ingot, zinc ingot, alloys
  Tel: 0772-2619220   2619221
 
Important Notes: These silver ingot suppliers are well-known for domestic market in China and most of them have NO direct Export License, foreign clients have to work with a qualified export or import agent like STIN (www.chinabizservices.com) in China if they'd like smooth business for such items. 
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