COMSTOCK RESOURCES, INC. AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) Results of continuing operations include the following non-routine items of income (expense), which are presented before the effect of income taxes: Gain on sales of oil and gas properties ................... Gain on sales of marketable securities .................... Impairments of unproved oil and gas properties ................ Impairments of proved oil and gas properties ................ Gain (loss) on sale of oil and gas properties ................... Gain on sales of marketable securities .................... Loss on early extinguishment of debt ........................ Impairments of unproved oil and gas properties ................ Impairments of proved oil and gas properties ................ Set forth below is a summary of the changes in Comstock’s net quantities of oil and natural gas reserves for its continuing operations for each of the three years in the period ended December 31, 2013: Beginning of year ....................... Revisions of previous estimates .......... Extensions and discoveries ............. Purchases of minerals in place ........... Disposals of minerals in place ........... Production .......................... End of year .......................... Beginning of year ....................... End of year ............................ Proved Developed Reserves: Proved Reserves: (12) Oil and Gas Reserves Information (Unaudited) 2012 First Second Third Fourth Total (In thousands) $ 6,727 $ 20,338 $ (2,794) $ — $ 24,271 $ 26,621 $ — $ — $ — $ 26,621 $ (1,315) $ — $ (1,370) $ (58,615) $ (61,300) $ (49) $ (5,301) $ — $ (20,018) $ (25,368) 2013 First Second Third Fourth Total $ — $ 81 $ (2,165) $ 51 $ (2,033) $ 7,877 $ — $ — $ — $ 7,877 $ — $ — $ — $ (17,854) $ (17,854) $ (2,443) $ (9,465) $ (2,995) $ (18,081) $ (32,984) $ — $ (652) $ — $ — $ (652) (In thousands) 2011 2012 2013 Oil (MBbls) Natural Gas (MMcf) Oil (MBbls) Natural Gas (MMcf) Oil (MBbls) Natural Gas (MMcf) 4,219 1,025,633 13,234 1,080,644 18,899 437,445 8 (36,150) 327 (529,272) 28 23,321 9,845 169,188 11,953 21,525 5,363 47,581 — 12,566 — — — — — — (4,823) (53,690) — — (838) (90,593) (1,792) (81,762) (2,314) (55,694) 13,234 1,080,644 18,899 437,445 21,976 452,653 2,961 506,809 6,499 546,627 8,389 362,426 6,499 546,627 8,389 362,426 13,914 344,278 F-29