OPERATORS · TEXAS · P-5 NUMBER 780216

Sierra Minerals, Inc.

10 PERMITS · PAGE 1 OF 1 · BY ISSUE DATE

IssuedPermitTypeCountyLease / wellDepthStatusAPIOperator change
May 27, 1988347122DrillBastropSteinback #2A4,400Spudded02131209Now Ernest Operating Company
May 20, 1988346830DrillBastropCook, B. M. #1A4,600—02131207Now Ernest Operating Company
Apr 7, 1988344909DrillBastropCook, B. M. #15,400Final completion02131196Now Trivista Operating LLC
Mar 23, 1988344296DrillBastropCourtemanche #15,400Final completion02131189Now Trivista Operating LLC
Feb 2, 1988342204DrillBastropSteinback #25,500Final completion02131165Now Trivista Operating LLC
Jan 13, 1988341374DrillBastropBarker Heirs #35,200Final completion02131159Now Trivista Operating LLC
Dec 15, 1987340246DrillBastropNoack, C. #35,150Plugged dry hole (P&A)02131140—
Nov 24, 1987339346DrillBastropNoack, C. #15,100Plugged dry hole (P&A)02131126—
Aug 5, 1987334021DrillBastropBarker Heirs #25,300Final completion02131070Now Trivista Operating LLC
Jul 16, 1987333035DrillBastropBarker Heirs #15,350Final completion02131062Now Texas Vanguard Oil Company