McEwen Files NI 43-101 Technical Reports: Grey Fox Prefeasibility Study in Ontario and Lookout Mountain and Windfall Mineral Resource Estimate in Nevada
Original announcement by globenewswire on
- Company
- McEwen Inc.
- Ticker
- MUX
- Exchange
- Unavailable
- Region
- Nevada
- Primary commodity
- Gold
- Secondary commodities
- Silver, Copper
- Document categories
- Resource update, Other
- Extracted
- 2026-08-20 20:01:06 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
McEwen Inc. has filed NI 43-101 technical reports including a Prefeasibility Study for the Grey Fox project in Ontario, which reports 9.41 Mt of Probable Reserves at 3.24 g/t Au. Additionally, the company filed resource estimates for the Lookout Mountain and Windfall deposits in Nevada, totaling over 890,000 gold ounces in Indicated and Inferred resources.
Reasoning: The filing includes a Prefeasibility Study for Grey Fox (reporting reserves) and updated Mineral Resource Estimates for Nevada assets.
Positive factors
- Probable Reserves reported for Grey Fox
- Significant gold ounces in Lookout Mountain and Windfall resources
- High proportion of oxide mineralization amenable to heap leach
Negative factors
- Resource estimates for Lookout Mountain and Windfall are restatements of previous announcements
Facts used in scoring: 7
Classification and evidence
Probable Reservepositive
Indicated Resource with demonstrated economic viability after applying modifying factors.
Why it applies: Grey Fox project reports 9.41 Mt of Probable Reserves.
Evidence · text
“supported by Probable Mineral Reserves of 9.41 million tonnes”
Inferred Resourcenegative
Speculative category — limited drilling, geological continuity assumed but not confirmed. Cannot support economic studies alone.
Why it applies: Lookout Mountain and Windfall contain significant Inferred resources.
Evidence · text
“262,000 gold ounces in Inferred Mineral Resources”
QP/CP Signedpositive
Qualified Person (QP) or Competent Person (CP) named and signed off — a member of a recognized professional association (e.g., AusIMM, SME, AIG, P.Geo) with relevant experience.
Why it applies: Multiple Qualified Persons are named for both technical reports.
Evidence · text
“The Grey Fox Report was prepared by the following Qualified Persons”
Extracted facts
Stored fact records: 7. Some facts used in scoring do not have a stored record.
Resource Estimates (7)
probableGrey Fox · goldTonnes: 9410000Grade: 3.24Grade Unit: g/tContained Metal: 980300Contained Unit: ozView all detailsHide details
Identity
- Project
- Grey Fox
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- Ticker
- MUX
Resource Data
- Category
- probable
- Tonnes
- 9410000
- Grade
- 3.24
- Grade Unit
- g/t
- Contained Metal
- 980300
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Probable reserves reported as part of a PFS.
Positive factors
- Strong grade and tonnage for reserves
Evidence · text
“Probable Mineral Reserves of 9.41 million tonnes grading 3.24 g/t Au and containing 980,300 gold ounces”
indicatedGrey Fox · goldTonnes: 9680000Grade: 2.25Grade Unit: g/tContained Metal: 701000Contained Unit: ozView all detailsHide details
Identity
- Project
- Grey Fox
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- Ticker
- MUX
Resource Data
- Category
- indicated
- Tonnes
- 9680000
- Grade
- 2.25
- Grade Unit
- g/t
- Contained Metal
- 701000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Indicated resource component of the Grey Fox project.
Positive factors
- Significant indicated resource
Evidence · text
“9.68 million tonnes at 2.25 g/t Au for 701,000 gold ounces Indicated”
inferredGrey Fox · goldTonnes: 4700000Grade: 2.57Grade Unit: g/tContained Metal: 388000Contained Unit: ozView all detailsHide details
Identity
- Project
- Grey Fox
- Commodity
- gold
- Region
- canada_on
- Reported Region
- Ontario
- Ticker
- MUX
Resource Data
- Category
- inferred
- Tonnes
- 4700000
- Grade
- 2.57
- Grade Unit
- g/t
- Contained Metal
- 388000
- Contained Unit
- oz
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Inferred resource component of the Grey Fox project.
Positive factors
- High grade for inferred category
Evidence · text
“4.70 million tonnes at 2.57 g/t Au for 388,000 gold ounces Inferred”
indicatedLookout Mountain · goldTonnes: 19570000Grade: 0.64Grade Unit: g/tContained Metal: 402300Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Lookout Mountain
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- MUX
Resource Data
- Category
- indicated
- Tonnes
- 19570000
- Grade
- 0.64
- Grade Unit
- g/t
- Contained Metal
- 402300
- Contained Unit
- oz
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2026-03-12T00:00:00.000Z
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Indicated resource for Lookout Mountain, previously announced in March 2026.
Positive factors
- Large tonnage indicated resource
Negative factors
- Restatement of previous estimate
Evidence · text
“Lookout Mountain: Indicated Mineral Resources of 19.57 million tonnes at 0.64 g/t Au, containing 402,300 gold ounces”
inferredLookout Mountain · goldTonnes: 7290000Grade: 0.57Grade Unit: g/tContained Metal: 134200Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Lookout Mountain
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- MUX
Resource Data
- Category
- inferred
- Tonnes
- 7290000
- Grade
- 0.57
- Grade Unit
- g/t
- Contained Metal
- 134200
- Contained Unit
- oz
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2026-03-12T00:00:00.000Z
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Inferred resource for Lookout Mountain, previously announced in March 2026.
Negative factors
- Restatement of previous estimate
Evidence · text
“Inferred Mineral Resources of 7.29 million tonnes at 0.57 g/t Au, containing 134,200 gold ounces”
indicatedWindfall · goldTonnes: 9400000Grade: 0.75Grade Unit: g/tContained Metal: 227500Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Windfall
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- MUX
Resource Data
- Category
- indicated
- Tonnes
- 9400000
- Grade
- 0.75
- Grade Unit
- g/t
- Contained Metal
- 227500
- Contained Unit
- oz
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2026-05-06T00:00:00.000Z
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Indicated resource for Windfall, previously announced in May 2026.
Negative factors
- Restatement of previous estimate
Evidence · text
“Windfall: Indicated Mineral Resources of 9.40 million tonnes at 0.75 g/t Au, containing 227,500 gold ounces”
inferredWindfall · goldTonnes: 2600000Grade: 1.53Grade Unit: g/tContained Metal: 127800Contained Unit: ozHistorical resultNeeds review: historical_restatementView all detailsHide details
Identity
- Project
- Windfall
- Commodity
- gold
- Region
- usa_nv
- Reported Region
- Nevada
- Ticker
- MUX
Resource Data
- Category
- inferred
- Tonnes
- 2600000
- Grade
- 1.53
- Grade Unit
- g/t
- Contained Metal
- 127800
- Contained Unit
- oz
Review
- Needs Review
- Yes
- Review Reason
- historical_restatement
- Historical
- Yes
- Historical Source Date
- 2026-05-06T00:00:00.000Z
Dates
- Event date
- 2026-07-22T00:00:00.000Z
Reasoning: Inferred resource for Windfall, previously announced in May 2026.
Positive factors
- Stronger grade for inferred category
Negative factors
- Restatement of previous estimate
Evidence · text
“Inferred Mineral Resources of 2.60 million tonnes at 1.53 g/t Au, containing 127,800 gold ounces”
How Atlas produces this analysis
Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.