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Royalty Clerk

Texas field · RRC field 85457500 · District 01

Stacy (Olmos -A-)

5 producing leases run by 3 operators in 1 Texas county. The field reported 7,612 barrels of oil and 0 mcf of gas in the 12 months through Jul 2026.

Field dossier · 1 county

7,612bbl oil, last 12 months−17% vs prior year
Producing leases
5of 7 on record
Operators
3
Counties
1
Biggest operator
Mazco Energy LLC

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Where the field sits

This county

Frio County: 5 producing leasesFrioZavalaAtascosaUvaldeMedinaBexarFrio County
1 countyClick a county to open it
RRC field no.
85457500
RRC district
01
Data through
Jul 2026
Leases on record
7

Production

Five years of output in Stacy (Olmos -A-)

Monthly totals across the leases the Railroad Commission assigns to this field.

Oil output in the Stacy (Olmos -A-) field fell 17% over the last 12 months

7,606 bbl in the 12 months through Jul 2026, against 9,204 bbl in the 12 months before. Peak month: Jul 2023, 1,140 bbl.

Oil output in the Stacy (Olmos -A-) field fell 17% over the last 12 months7,606 bbl in the 12 months through Jul 2026, against 9,204 bbl in the 12 months before. Peak month: Jul 2023, 1,140 bbl.Oil, bbl per month02505007501,0001,250Peak 1,140 (Jul 23)54620222023202420252026
Oil output in the Stacy (Olmos -A-) field fell 17% over the last 12 months7,606 bbl in the 12 months through Jul 2026, against 9,204 bbl in the 12 months before. Peak month: Jul 2023, 1,140 bbl.Oil, bbl per month02505007501,0001,250Peak 1,140 (Jul 23)546'22'23'24'25'26

SourceTexas Railroad Commission, Production Data Query, summed over the leases assigned to field 85457500. Reported through Jul 2026, file dated Sep 18, 2026. The newest month is often revised as operators file late.

Leases

Leases in the Stacy (Olmos -A-) field

Ranked by last-12-month output. Filter by operator, and open any lease for its month-by-month ledger.

Showing 5 of 5.

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SourceTexas Railroad Commission, Production Data Query. Ranked by an approximate value of last-12-month output, so oil and gas wells sort together.

In the Stacy (Olmos -A-) field

Who operates here, and where

Each operator and county links to its own page, so you can see the rest of what they run.

Operators in this field, by oil

Mazco Energy leads

  1. Mazco Energy LLC3 producing leases here4,679bbl
  2. Neumann Oil & Gas, LLC1 producing lease here2,682bbl
  3. JM Calk Operating, LLC1 producing lease here251bbl

Counties in this field, by oil

Frio County leads

  1. Frio County5 producing leases7,612bbl

Recent drilling permits in the Stacy (Olmos -A-) field

No recent drilling permits in this field are in our data yet.

For owners

What a field is, and why it matters to your check

RRC field number
85457500
RRC district
01
Leases on record
7
Producing leases
5

The Railroad Commission assigns each lease to a field: the underground pool or formation it produces from. A field can cross county lines and hold leases from many operators. Leases in the same field often move together, because they draw on the same rock.

That makes the field a fair yardstick. If your lease fell sharply and the rest of Stacy (Olmos -A-) did not, that is worth a question to your operator. If the whole field fell, the cause is probably geology or price, not your check.

The field trend above sums every lease in the field, so it is a good comparison for the lease page of any lease listed here.