Skip to content
Royalty Clerk

Texas oil lease

Producing

MAMMOTH CAVE 21-4 B

Mammoth Cave 21-4 B is an oil lease in Dawson County, Texas, operated by Ike Operating, LLC in the Spraberry (Trend Area) field.

1 well

99,988bbl oil, last 12 months
Operator
Ike Operating, LLC
County
Dawson County
Field
Spraberry (Trend Area)
RRC lease
08-63298

Is your check right?

Check my statement

Where it sits

This county

Dawson CountyDawsonGainesLynnGarzaAndrewsTerryBordenDawson County
Dawson County
Gas, last 12 months
96,849 mcf
Oil in Jul 2026
7,506 bbl

Production by month

Oil output fell 67% since Sep 2024

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 67% since Sep 2024Monthly oil production and gas for MAMMOTH CAVE 21-4 B, Sep 2024 to Jul 2026. Oil output fell 67% since Sep 2024. Monthly average of 7,415 bbl in the latest 3 months, against 22,434 bbl in the first 3.Last 12 months: 99,988 bblbbl per monthmcf per month0010k2,50020k5,00030k7,50040k10k50k12.5kOct 24Jan 25AprJulOctJan 26AprJul
Oil output fell 67% since Sep 2024Monthly oil production and gas for MAMMOTH CAVE 21-4 B, Sep 2024 to Jul 2026. Oil output fell 67% since Sep 2024. Monthly average of 7,415 bbl in the latest 3 months, against 22,434 bbl in the first 3.Last 12 monthsbbl per monthmcf per month0010k2,50020k5,00030k7,50040k10k50k12.5kJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

Since Mar 2025 the lease's gas goes to a transmission line instead of lease fuel

Flaring peaked at 23.8% of the gas in Feb 2026.

  • Transmission line (2)
  • Lease fuel (1)
  • Flared (4)
Since Mar 2025 the lease's gas goes to a transmission line instead of lease fuelShare of MAMMOTH CAVE 21-4 B gas by disposition code each month, Sep 2024 to Jul 2026. Since Mar 2025 the lease's gas goes to a transmission line instead of lease fuel. Flaring peaked at 23.8% of the gas in Feb 2026.Share of the lease’s gas by disposition code, per month0%50%100%Mar 2025: fuel to lineFlared 23.8%Oct 24Jan 25AprJulOctJan 26AprJul
Since Mar 2025 the lease's gas goes to a transmission line instead of lease fuelShare of MAMMOTH CAVE 21-4 B gas by disposition code each month, Sep 2024 to Jul 2026. Since Mar 2025 the lease's gas goes to a transmission line instead of lease fuel. Flaring peaked at 23.8% of the gas in Feb 2026.Share of gas by disposition code0%50%100%Mar 25: fuel to lineFlared 23.8%Jan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

  • Transmission line (2)

    60% · 58,243 mcf

  • Lease fuel (1)

    30% · 29,341 mcf

  • Flared (4)

    9.6% · 9,265 mcf

9.6% of the gas flared in the last 12 months. 9 months above 3%.

1 well on this lease

Wells on MAMMOTH CAVE 21-4 B
API numberWell no.Status
42-115-339806DNActive

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%From
Energy Transfer CompanyOilGathers100Sep 10, 2024
Targa Pl Mid-Cont Westtex LLCCasinghead gasBuys100Sep 10, 2024
Targa Pl Mid-Cont Westtex LLCCasinghead gasGathers100Sep 10, 2024

SourceRailroad Commission Form P-4 file, Sep 24, 2026 (source).

Who buys my oilOil price check

1,120 acres on the newest permit

  • Worth asking

    An allocation well is on this lease

    A well drilled across several tracts shares its production by an allocation formula, so the decimal is not always your acres over the unit acres. Ask the operator for the allocation formula and the tract factor for your land.

  • Worth asking

    A Rule 37 case is listed

    The RRC permit records list a Rule 37 case. This does not establish your royalty share. Ask for the permit and unit plat for your well.

Check your decimal on this lease
Permits for Mammoth Cave 21-4 B
API numberWell no.Acreson the permit
42-115-339806DN1,120

SourceRailroad Commission drilling permits, Oct 3, 2026 (source 1, source 2).

Unit decimal checker

Estimate your royalty

23 months, newest first

Ledger for MAMMOTH CAVE 21-4 B
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 20267,5067,5325,9043,76925$80.46$2.89
Jun 20267,5567,5226,0172,5651,255$84.81$3.15
May 20267,1847,1798,8045,566396$102.13$2.94
Apr 20267,2337,2368,1873,8571,916$100.32$2.77
Mar 20267,8827,89110,1266,560906$91.38$3.04
Feb 20267,6167,6368,7264,3912,077$64.51$3.62
Jan 202611,72011,70211,5956,0022,135$60.04$7.72
Dec 20259,8189,8169,9156,616253$57.97$4.26
Nov 202511,06011,06410,5327,24417$60.06$3.79
Oct 20259,2299,2287,3095,02261$60.89$3.19
Sep 20258,3738,3525,5453,92996$63.96$2.97
Aug 20254,8114,8204,1892,722128$64.86$2.91
Jul 20256,8106,8225,6683,88169$68.39$3.20
Jun 202511,49311,4904,3023,11743$68.17$3.02
May 202513,01313,0374,7413,354145$62.17$3.12
Apr 202513,38513,4065,2683,89617$63.54$3.42
Mar 202514,57414,6144,1202,99736$68.24$4.12
Feb 202516,00416,0553,8661,88554$71.53$4.19
Jan 202521,33221,3551,71070035$75.74$4.13
Dec 202423,19123,1353,8581,42565$70.12$3.01
Nov 202423,59323,5814,7382,12554$69.95$2.12
Oct 202426,15426,2615,5792,92716$71.99$2.20
Sep 202417,55617,3283,5862,049126$70.24$2.28

Flared above 3%

SourceTexas Railroad Commission Production Data Query, through Jul 2026. Prices: EIA, through Aug 2026. Updated Oct 2, 2026.

How to check your stub against this lease Checks stopped on this lease? See the likely reasons

Do your checks match this lease?

Check my statement

Nearby

This lease belongs to

OperatorIke Operating, LLCFieldSpraberry (Trend Area)CountyDawson County

Ike Operating, LLC in Dawson County

All Ike Operating, LLC leases →

Spraberry (Trend Area) field

All leases in this field →

Leases within 10 km

Drilling permits within 10 km