The depreciation and amortization is usually for the equipments...

The depreciation and amortization is usually for the equipments and capital exploration costs, they could not be written off at the same year if the operation is still ongoing for the following years

Doubling the revenue is not an issue for a company, even my small company I raise about 5 times on revenue last year

The key life line is the profit and cash flow

The gold industry is really different from other industry,as the could recognize revenue when the gold produced straightway and the liquidity of gold will be an advantage for cash flow

That is why they could use the cash operating costs.

But anyway, they are still making losses