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KEYSTONE MILLS

Keystone Mills is an oil lease in Montgomery County, Texas, operated by Highmark Energy Operating, LLC in the Conroe (Middle Wilcox Cons.) field.

1 well

143bbl oil, last 12 months−94% vs prior year
Operator
Highmark Energy Operating, LLC
County
Montgomery County
Field
Conroe (Middle Wilcox Cons.)
RRC lease
03-25398

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Where it sits

This county

Montgomery CountyMontgomeryWalkerSan JacintoMadisonLibertyWallerGrimesPolkMontgomery County
Montgomery County
Gas, last 12 months
124 mcf
Oil in Jul 2026
10 bbl

Checks stopped on this lease?

  • Operator

    Operator changed: Highmark Energy Operating, LLC took over from Denbury Onshore, LLC in Nov 2024.

  • Sales

    Sales over the last 3 months fell to 21% of the 9 months before.

SourceRailroad Commission production, P-5 and P-4 records, data through Jul 2026.

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Production by month

Oil output fell 94% over the last 12 months

  • Oil (bars)
  • Gas (line)
  • Last 12 months
Oil output fell 94% over the last 12 monthsMonthly oil production and gas for KEYSTONE MILLS, Aug 2023 to Jul 2026. Oil output fell 94% over the last 12 months. 143 bbl in the 12 months through Jul 2026, against 2,511 bbl in the 12 months before.Last 12 months: 143 bblbbl per monthmcf per month00100200200400300600400800Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
Oil output fell 94% over the last 12 monthsMonthly oil production and gas for KEYSTONE MILLS, Aug 2023 to Jul 2026. Oil output fell 94% over the last 12 months. 143 bbl in the 12 months through Jul 2026, against 2,511 bbl in the 12 months before.Last 12 monthsbbl per monthmcf per month00100200200400300600400800Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Where the gas went

All of the gas went to a transmission line in the last 12 months

Flaring peaked at 77.6% of the gas in Aug 2023.

  • Transmission line (2)
  • Lease fuel (1)
  • Flared (4)
All of the gas went to a transmission line in the last 12 monthsShare of KEYSTONE MILLS gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a transmission line in the last 12 months. Flaring peaked at 77.6% of the gas in Aug 2023.Share of the lease’s gas by disposition code, per month0%50%100%Flared 77.6%Oct 23Jan 24AprJulOctJan 25AprJulOctJan 26AprJul
All of the gas went to a transmission line in the last 12 monthsShare of KEYSTONE MILLS gas by disposition code each month, Aug 2023 to Jul 2026. All of the gas went to a transmission line in the last 12 months. Flaring peaked at 77.6% of the gas in Aug 2023.Share of gas by disposition code0%50%100%Flared 77.6%Jan 24JulJan 25JulJan 26Jul

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

Who has run this lease

The operator changed once, most recently in Nov 2024

Operators of this lease over timeDenbury Onshore, LLC, Jan 2020 to Oct 2024; Highmark Energy Operating, LLC, Nov 2024 to Jul 20262020202120222023202420252026Changed Nov 2024Denbury Onshore, LLCJan 2020 to Oct 2024Highmark Energy Operating, LLCNov 2024 to now
Operators of this lease over timeDenbury Onshore, LLC, Jan 2020 to Oct 2024; Highmark Energy Operating, LLC, Nov 2024 to Jul 20262020202120222023202420252026Changed Nov 2024Denbury Onshore, LLCJan 2020 to Oct 2024Highmark Energy Operating, LLCNov 2024 to now

SourceTexas Railroad Commission Production Data Query, through Jul 2026.

1 well on this lease

Wells on KEYSTONE MILLS
API numberWell no.Status
42-339-3060840Active

SourceTexas Railroad Commission Wellbore Query.

Buyers and gatherers

Companies named on the Form P-4, by product
CompanyProductRoleShare%FromUntil
Endeavor Crude, LLCOilGathers100Nov 1, 2024–
Gulf South Pipeline Company, LLCCasinghead gasBuys100May 1, 2022–
Highmark Energy Operating, LLCCasinghead gasGathers100Nov 1, 2024–
Denbury Onshore, LLCCasinghead gasGathers100Mar 27, 2017Nov 1, 2024
Endeavor Crude, LLCOilGathers80May 1, 2022Nov 1, 2024
Sunoco Ptnrs. Mktg.&terminals LPOilGathers20May 1, 2022Nov 1, 2024
Texla Energy Management, Inc.Casinghead gasBuys100Jan 1, 2020May 1, 2022
Energy Trans Crude Marketing LLCOilGathers50Jul 1, 2021May 1, 2022
Sunoco Ptnrs. Mktg.&terminals LPOilGathers50Jul 1, 2021May 1, 2022

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

Who buys my oilOil price check

651 acres on the newest permit

Check your decimal on this lease
Permits for Keystone Mills
API numberWell no.Acreson the permit
42-339-3060840651

SourceRailroad Commission drilling permits, Sep 26, 2026 (source 1, source 2).

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36 months, newest first

Ledger for KEYSTONE MILLS
MonthOil producedbblOil soldbblGas producedmcfGas soldmcf, codes 2+3FlaredmcfWTI$/bblHenry Hub$/MMBtu
Jul 2026Highmark Energy10815150$80.46$2.89
Jun 2026Highmark Energy11220$84.81$3.15
May 2026Highmark Energy12330$102.13$2.94
Apr 2026Highmark Energy65880$100.32$2.77
Mar 2026Highmark Energy22110$91.38$3.04
Feb 2026Highmark Energy22330$64.51$3.62
Jan 2026Highmark Energy22440$60.04$7.72
Dec 2025Highmark Energy00000$57.97$4.26
Nov 2025Highmark Energy05000$60.06$3.79
Oct 2025Highmark Energy383621210$60.89$3.19
Sep 2025Highmark Energy232620200$63.96$2.97
Aug 2025Highmark Energy587947470$64.86$2.91
Jul 2025Highmark Energy22523686860$68.39$3.20
Jun 2025Highmark Energy2962591701700$68.17$3.02
May 2025Highmark Energy162113130$62.17$3.12
Apr 2025Highmark Energy567351510$63.54$3.42
Mar 2025Highmark Energy1971842192190$68.24$4.12
Feb 2025Highmark Energy1381371311310$71.53$4.19
Jan 2025Highmark Energy18919957570$75.74$4.13
Dec 2024Highmark Energy2042101971970$70.12$3.01
Nov 2024Highmark Energy2662672972970$69.95$2.12
Oct 2024Denbury Onshore,2873104533426$71.99$2.20
Sep 2024Denbury Onshore,3373054773670$70.24$2.28
Aug 2024Denbury Onshore,3003434943740$76.68$1.99
Jul 2024Denbury Onshore,31128948833411$81.80$2.07
Jun 2024Denbury Onshore,2462204173148$79.77$2.54
May 2024Denbury Onshore,95832021593$80.02$2.12
Apr 2024Denbury Onshore,00000$85.35$1.60
Mar 2024Denbury Onshore,019000$81.28$1.49
Feb 2024Denbury Onshore,1831762182020$77.25$1.72
Jan 2024Denbury Onshore,1962002802515$74.15$3.18
Dec 2023Denbury Onshore,21920964852219$71.90$2.52
Nov 2023Denbury Onshore,648060151128$77.69$2.71
Oct 2023Denbury Onshore,1711645424401$85.64$2.98
Sep 2023Denbury Onshore,186178548343104$89.43$2.64
Aug 2023Denbury Onshore,15716055720432$81.39$2.58

Flared above 3%

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

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This lease belongs to

OperatorHighmark Energy Operating, LLCFieldConroe (Middle Wilcox Cons.)CountyMontgomery County

Highmark Energy Operating, LLC in Montgomery County

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Conroe (Middle Wilcox Cons.) field

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