The Phosphoria formation

Free written valuation

What are your Phosphoria minerals worth?

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What kind of interest do you own? Not sure Producing — I get monthly or quarterly checks Leased but not producing — bonus paid, no checks yet Not leased / not producing — I just own the minerals I am not sure

County

Operator / who sends your checks

Average monthly royalty check (last 3 to 6 months) Prefer not to say $0 (not producing) $1–$100 $100–$500 $500–$2,000 $2,000–$10,000 $10,000+

Your check is the single fastest path to a value range. Fill the acres below instead if you do not get checks.

Net mineral acres

Royalty fraction Not sure 1/8 (12.5%), historical standard3/16 (18.75%), modern standard1/5 (20%), common in the Permian1/4 (25%), hot plays1/6 (16.67%), federal minimum since 2022

Unit size (acres)

Interest type, if you know it Not sure Royalty interest The minerals themselves Overriding royalty (ORRI) Working interest Non-participating royalty (NPRI)

How did you come to own it? Prefer not to say Inherited it Kept (reserved/severed) when family sold the land Purchased it

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The Phosphoria shows up in state oil and gas commission well records as a producing formation or pool in 6 of the counties and parishes we cover, across the Bighorn Basin. Every county where it produces sits in the same basin, though well counts and operators differ county to county. Across those counties, state records show 4,505 active wells producing, with the heaviest activity in Park County, Hot Springs County, Big Horn County. This page is built from the same public well-record data as our county pages, not a USGS geologic assessment, so it does not carry a play-wide resource estimate the way our larger flagship formation pages do.

Counties in the Phosphoria play

These are the counties and parishes we cover where state commission records show the Phosphoria producing. Each links to that county's own Phosphoria well count and operators, not just the general county page.

What the Phosphoria means for your minerals

A resource estimate for a play is not the value of your acreage. Your mineral and royalty interest is valued on the income your wells actually pay, roughly 36 to 72 times your average monthly royalty check, the same as 3 to 6 times your annual royalty. Where you land in that band depends on your wells decline, the operator, your royalty rate, and any undeveloped drilling upside. For the full method and a free on-screen estimate, see what are my mineral rights worth.

The Phosphoria is part of the Bighorn Basin. For the basin-wide value bands and the counties we buy in, see the Bighorn Basin page.

Phosphoria questions

Which counties does the Phosphoria produce in?

State commission well records show the Phosphoria producing in 6 counties we cover: Big Horn County, Big Horn County, Carbon County, Hot Springs County, Park County, Washakie County. See each county's page for the full local well and operator picture.

How many wells produce from the Phosphoria?

Across the counties we cover, state oil and gas commission records show about 4,505 active wells tied to the Phosphoria. That figure is a sum across counties from public well records, not a measure of any one owner's interest.

What is a Phosphoria mineral interest worth?

A Phosphoria interest is valued the same way as any producing interest: roughly 36 to 72 times your average monthly royalty check. Where you land in that range depends on your wells' decline, the operator, your royalty rate, and any undeveloped drilling upside. This is an estimate, not an offer.

Sources

• Montana Board of Oil and Gas Conservation (MBOGC) wells (Montana DNRC ArcGIS public service); county assignment via U.S. Census TIGERweb county boundaries
• Wyoming Oil and Gas Conservation Commission (WOGCC) active wells (Wyoming GIS Center ArcGIS public service)

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