Sphinx Mining Systems, LLC
Rolla, MO
- UEI
- WE5QK5TCJNX9
- CAGE
- 9C1Z6
- Primary NAICS
- 213114 Support Activities for Metal Mining
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- Other NAICS codes in SAM.gov
- SAM.gov registration date
- Physical address
- 10530 Pine Needle Cir, Rolla, MO 65401, USA
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $0 |
| FY2026 | -$20,034 |
| FY2025 | $0 |
| FY2024 | $82,753 |
| FY2023 | $98,249 |
Contract awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Expert witness services required for the litigation of a case by the internal revenue service, chief counsel. | Internal Revenue Service | $116,498 | |
| Expert witness - offei | Internal Revenue Service | $4,800 | |
| Expert witness services | Internal Revenue Service | $13,200 | |
| Expert witness services | Internal Revenue Service | $26,470 |
Similar vendors
| Vendor | Location | Primary NAICS |
|---|---|---|
| SAF Mining Consulting LLC | Rolla, MO | 541690 Other Scientific and Technical Consulting Services |
| GE Stephens Compliance Consulting And Training | — | 813920 Professional Organizations |
| MTC Consulting LLC | White Plains, GA | 541620 Environmental Consulting Services |
| M.b. Main Enterprise LLC | Gainesville, FL | 541620 Environmental Consulting Services |
| Real Estate Valuation Advisors LLC | Birmingham, AL | 531320 Offices of Real Estate Appraisers |
About the company
Sphinx Mining Systems, LLC, a Black American-owned, minority-owned small disadvantaged business based in Rolla, Missouri, provides expert witness services to the Internal Revenue Service exclusively as a prime contractor on a labor-hours pricing model. The company operates in a single customer relationship with zero subcontract exposure and no participation on government-wide vehicles or agency IDIQs.
Sphinx Mining Systems has received four purchase order contracts from the IRS Chief Counsel, all for expert witness services in federal tax litigation and related proceedings. The oldest award, dated November 1, 2022, carried a ceiling of $26,470.26 and closed out through February 24, 2026. A second award from November 3, 2022, established a ceiling of $120,253.00 with ultimate completion on November 2, 2027. A third contract, dated April 17, 2024, was substantially deobligated to $4,800 and closes on April 16, 2029. The most recent award, dated April 16, 2026, establishes a ceiling of $349,208.20 and runs through April 15, 2031. All four awards are classified under NAICS 541690 (Other Scientific and Technical Consulting Services) or 212399 (Support Activities for Nonmetallic Minerals Mining) and fall under PSC code Support-Professional: Expert Witness. Performance locations span Rolla, Missouri and Atlanta, Georgia. All awards carry no set-aside designation and reflect full-and-open competition.
Sphinx Mining Systems' entire customer footprint concentrates on the Department of the Treasury Internal Revenue Service with $501 thousand in combined potential value across all awards. Of that total, $190 thousand has been obligated, representing 38% utilization. One award ($120 thousand potential value) faces ultimate completion within the next twenty-four months, creating a recompete opportunity. Activity is sparse — two awards in 2022, one in 2024, one in 2026 — and the vendor operates purely as a prime with no visible subcontractor presence in federal work.
Quick answers
Is Sphinx Mining Systems, LLC registered in SAM.gov?
Yes. Sphinx Mining Systems, LLC's SAM.gov registration is active through August 30, 2027.
How much has Sphinx Mining Systems, LLC received in federal contracts?
Federal contracts obligated $160,968 to Sphinx Mining Systems, LLC in fiscal years 2023 through 2027.
What is Sphinx Mining Systems, LLC's most recent federal award?
Sphinx Mining Systems, LLC's most recent federal contract award is Expert witness services required for the litigation of a case by the internal revenue service, chief counsel (2023H226P00239), from Internal Revenue Service, on April 16, 2026.
On GovTribe
See Sphinx Mining Systems, LLC's full federal record
- Federal contract awards
- Funding analysis by agency, NAICS and set-aside
- Similar vendors