v2.4.0.6

SUPPLEMENTAL OIL AND GAS DISCLOSURE (unaudited) (Details 6) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Net changes in sales and transfer prices and in production (lifting) costs related to future production	$ 0	$ 0
Changes in estimated future development costs	0	0
Sales and transfers of oil and gas produced during the period	(100)	0
Net change due to extensions, discoveries and improved recovery	30,244	0
Net change due to purchases and sales of minerals in place	0	0
Net change due to revisions in quantity estimates	0	0
Previously estimated development costs incurred during the period	0	0
Accretion of discount	0	0
Other - unspecified	0	0
Net change in income taxes	0	0
Aggregate change in the standardized measure of discounted net cash flows for the year	$ 30,144	$ 0

Net change in the discounted value of the proved oil and gas reserves due to financial transactions where new reserves were purchased and sales.

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The increase in the net discounted value of the proved oil and gas reserves due only to the passage of time.

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This is the amount that proved oil and gas reserves increased due to extensions (increased estimates in the size of proven reserves), discoveries, additions, and improved recovery (increase in ability to extract oil and gas from existing reserves).

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The increase (decrease) in the evaluation or calculation of the costs that will be required in future periods to make it possible to extract or process proved oil and gas reserves.

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The increase (decrease) in the estimate of future income taxes that will be due on future pretax net cash flows relating to the enterprise's proved oil and gas reserves.

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The increase (decrease) in sales and transfer prices and in production (lifting) costs related to future production. The effects of changes in prices and costs are computed before the effects of changes in quantities.

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The actual costs incurred during the reporting period to make it possible to extract or process proved oil and gas reserves. These costs were previously estimated and reduced the estimate of discounted future cash flows from oil and gas reserves.

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Any changes made during the period to the evaluation or calculation of the estimated quantity of oil or gas in proved reserves.

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The amount of sales or transfers of oil gas that was previously included in proved oil and gas reserves. This amount is net of production costs.

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Changes in the standardized measure of discounted future net cash flows relating to proved oil and gas reserves that are not otherwise specified in the taxonomy.

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The increase (decrease) as a result of changes in the elements used to estimate the discounted future net cash flow relating to proved oil and gas reserves.

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Rio Bravo Oil, Inc. 10-K