The men began their protest when their shift ended on Tuesday morning and refuse to come up even though the mine's owner says it won't shut down the operation as planned.
All involved banks will also have to produce all relevant chat room instant messages and any other written communication they exchanged, whatever the media.
The company remains confident the sale of its Rustenburg mines in South Africa to Sibanye Gold will clear its last regulatory hurdle before the end of the year.
The company's stock has fared better than many competitors in the last two years, boosted by the resilience of the lithium price, which has tripled since 2000 regardless of the commodity cycle.