With the official rate of 2.15 bolivars to the US$, and the black market rate of 7 to the USD, miners are effectively selling 70% of their production @ 30% of the world price.

If the world market price of gold is $950 an ounce then the Ven Central bank pays 2,042 bolivars when the "real" world price in bolivars is 6,650. Most, if not all of your local expenses are paid in bolivars but without access to currency at the official rate all imports are going to be paid for in US$ bought at the "unofficial" rate of 6.5 to 7 to the dollar. When 70% of your output is sold for $285 an ounce, well under the cost of production, it's hard to make a profit on the remaining 30% which you still can't sell at the world price without an export license!

I'll bet that getting an export licence to sell gold is just as hard as getting a mining permit, and with a few palms to be greased in the process..