Workers at Oakbay Investments appealed on Wednesday to South African banks to restore relations with their company.
The rand fell to 14.3750 versus the dollar earlier in the session, and was trading at 14.3015.
At least six people have been murdered in the capital in the past four weeks and police said some body parts.
More than 95% of those living without electricity are in Sub-Saharan Africa and developing Asia.
S.Africa's government will talk with mining firms to overcome differences in a new proposed Mining Charter.
Sinosteel Corp Ltd's business in Zimbabwe has ceded half its mining claims to the government.