Indonesian Mining Department : since the policy was adjusted in 2017，the total volume of nickle ore export had reached 8.6 million tons until Mar 31st, 2018.

China outpacing West in EV rollout, but numbers remain small: analyst

Comilog ：the manganese ore quotation to China in May

South 32 ：the second round quotation to China

ANTAM’s exploration report in March

Ferro-Alloys.com: Chrome Ore Prices 18 April 2018

Ferro-Alloys.com: HC Ferro-Chrome Market Prices 18 April 2018

Ferro-Alloys.com: HC Ferro-Chrome Market Prices 18 April 2018