Silver Bow Mining Intersects Massive Sulfide Mineralization Grading 8.20% CuEq over 0.82 Meters at the Rainbow Block
Original announcement by prospectors_exchange on
- Company
- Silver Bow Mining Corp.
- Ticker
- SBMT
- Exchange
- Unavailable
- Region
- Montana
- Primary commodity
- Copper
- Secondary commodities
- Silver, Zinc
- Document categories
- Drill results
- Extracted
- 2026-09-22 14:26:11 UTC
Analysis by Minestarters Atlas
Atlas analysis published:
Minestarters Atlas analysis
Summary
Silver Bow Mining has reported a high-grade intersection of 8.20% CuEq over 0.82 meters in drill hole SBM26-09 at the Rainbow Block Project in Montana. The intercept, located on the Black Rock Copper Vein, sits approximately 30 meters below a historical unmined copper-silver block identified in 1978 Anaconda records.
Reasoning: The intercept of 8.20% CuEq is strong for a vein-hosted system, and its location below a known historical unmined block provides significant geological validation, though narrow width and recovery issues limit immediate certainty.
Positive factors
- High-grade CuEq intercept
- Consistent with historical Anaconda records
- Located below unmined historical block
Negative factors
- Narrow intercept width
- Uncertain true width due to low core recovery in overlying interval
- Assays for other vein systems still pending
Facts used in scoring: 5
Classification and evidence
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: Release mentions systematic insertion of blanks and certified reference materials and an ISO 17025 accredited lab.
Evidence · text
“includes the systematic insertion of blanks and certified reference materials”
Nearology Playneutral
Value premise rests on proximity to a known deposit rather than own results.
Why it applies: The intercept is positioned immediately below a historical unmined copper-silver block from Anaconda records.
Evidence · text
“located approximately 30 meters (98 feet) below a copper-silver block shown as unmined in Anaconda’s historical”
Extracted facts
Stored fact records: 5. Some facts used in scoring do not have a stored record.
Drill Results (5)
SBM26-09Rainbow Block · copperGrade: 6.22Grade Unit: %Intercept: 0.82 mView all detailsHide details
Identity
- Hole ID
- SBM26-09
- Project
- Rainbow Block
- Commodity
- copper
- Region
- usa_mt
- Reported Region
- usa_mt
- Ticker
- SBMT
Geometry
- Grade
- 6.22
- Grade Unit
- %
- Intercept
- 0.82 m
- From
- 662.15 m
- To
- 662.97 m
- Hole Depth
- 664.65 m
- Intercept Depth
- 662.15 m
Classification
- Sample Type
- drill
- Group ID
- SBM26-09:662.15-662.97
- Mining Method
- underground
Location
- Location
- Black Rock Copper Vein
- Easting
- 382070
- Northing
- 5098822
- CRS
- WGS84 UTM Zone 12N
- Elevation
- 6209 m
- Azimuth
- 14 °
- Dip
- -57 °
- Loc. Confidence
- high
- Loc. Source
- document
QA/QC
- Laboratory
- American Analytical Services (AAS)
- QA/QC Disclosed
- Yes
- Lab Certified
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks
Metal Equivalent
- Metal Eq. Grade
- 8.2
- Metal Eq. Unit
- % CuEq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: 6.22% Cu is a strong grade for a vein-hosted massive sulfide.
Positive factors
- High grade
Evidence · table
“6.22”
Context: 0.82
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
SBM26-09Rainbow Block · silverGrade: 207.1Grade Unit: g/tIntercept: 0.82 mView all detailsHide details
Identity
- Hole ID
- SBM26-09
- Project
- Rainbow Block
- Commodity
- silver
- Region
- usa_mt
- Reported Region
- usa_mt
- Ticker
- SBMT
Geometry
- Grade
- 207.1
- Grade Unit
- g/t
- Intercept
- 0.82 m
- From
- 662.15 m
- To
- 662.97 m
- Hole Depth
- 664.65 m
- Intercept Depth
- 662.15 m
Classification
- Sample Type
- drill
- Group ID
- SBM26-09:662.15-662.97
- Mining Method
- underground
Location
- Location
- Black Rock Copper Vein
- Easting
- 382070
- Northing
- 5098822
- CRS
- WGS84 UTM Zone 12N
- Elevation
- 6209 m
- Azimuth
- 14 °
- Dip
- -57 °
- Loc. Confidence
- high
- Loc. Source
- document
QA/QC
- Laboratory
- American Analytical Services (AAS)
- QA/QC Disclosed
- Yes
- Lab Certified
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks
Metal Equivalent
- Metal Eq. Grade
- 8.2
- Metal Eq. Unit
- % Cu-Eq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: 207.1 g/t Ag is a significant byproduct grade in this copper intercept.
Positive factors
- Strong silver grade
Evidence · table
“207.1”
Context: 0.82
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
SBM26-09Rainbow Block · zincGrade: 0.27Grade Unit: %Intercept: 0.82 mView all detailsHide details
Identity
- Hole ID
- SBM26-09
- Project
- Rainbow Block
- Commodity
- zinc
- Region
- usa_mt
- Reported Region
- usa_mt
- Ticker
- SBMT
Geometry
- Grade
- 0.27
- Grade Unit
- %
- Intercept
- 0.82 m
- From
- 662.15 m
- To
- 662.97 m
- Hole Depth
- 664.65 m
- Intercept Depth
- 662.15 m
Classification
- Sample Type
- drill
- Group ID
- SBM26-09:662.15-662.97
- Mining Method
- underground
Location
- Location
- Black Rock Copper Vein
- Easting
- 382070
- Northing
- 5098822
- CRS
- WGS84 UTM Zone 12N
- Elevation
- 6209 m
- Azimuth
- 14 °
- Dip
- -57 °
- Loc. Confidence
- high
- Loc. Source
- document
QA/QC
- Laboratory
- American Analytical Services (AAS)
- QA/QC Disclosed
- Yes
- Lab Certified
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks
Metal Equivalent
- Metal Eq. Grade
- 8.2
- Metal Eq. Unit
- % Cu-Eq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: 0.27% Zn is a minor trace component in this intercept.
Evidence · table
“0.27”
Context: 0.82
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
SBM26-09Rainbow Block · copperGrade: 6.22Grade Unit: %Intercept: 2.7 mView all detailsHide details
Identity
- Hole ID
- SBM26-09
- Project
- Rainbow Block
- Commodity
- copper
- Region
- usa_mt
- Reported Region
- usa_mt
- Ticker
- SBMT
Geometry
- Grade
- 6.22
- Grade Unit
- %
- Intercept
- 2.7 m
- From
- 2172.4 m
- To
- 2175.1 m
- Intercept Depth
- 2172.4 m
Classification
- Sample Type
- drill
- Group ID
- SBM26-09:2172.4-2175.1
- Mining Method
- underground
Location
- CRS
- WGS84 UTM Zone 12N
QA/QC
- Laboratory
- American Analytical Services (AAS)
- QA/QC Disclosed
- Yes
- Lab Certified
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks
Metal Equivalent
- Metal Eq. Grade
- 8.2
- Metal Eq. Unit
- % Cu-Eq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Expanded from assay table. 6.22 % copper is exceptional against the default band [2.5, 1, 0.5, 0.25] %. Grade×width 16.8 %·m is below (grade alone is exceptional; the better of the two is used).
Positive factors
- 6.22 % copper is exceptional on the default band.
Negative factors
- Scored from rubric bands during table expansion, not from document context.
Evidence · table
“6.22”
Context: SBM26-09
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
SBM26-09Rainbow Block · zincGrade: 0.27Grade Unit: %Intercept: 2.7 mView all detailsHide details
Identity
- Hole ID
- SBM26-09
- Project
- Rainbow Block
- Commodity
- zinc
- Region
- usa_mt
- Reported Region
- usa_mt
- Ticker
- SBMT
Geometry
- Grade
- 0.27
- Grade Unit
- %
- Intercept
- 2.7 m
- From
- 2172.4 m
- To
- 2175.1 m
- Intercept Depth
- 2172.4 m
Classification
- Sample Type
- drill
- Group ID
- SBM26-09:2172.4-2175.1
- Mining Method
- underground
Location
- CRS
- WGS84 UTM Zone 12N
QA/QC
- Laboratory
- American Analytical Services (AAS)
- QA/QC Disclosed
- Yes
- Lab Certified
- Yes
- QP Signed
- Yes
- QA/QC Methods
- standards, blanks
Metal Equivalent
- Metal Eq. Grade
- 8.2
- Metal Eq. Unit
- % Cu-Eq
- Assumptions Disclosed
- Yes
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-21T00:00:00.000Z
Reasoning: Expanded from assay table. 0.27 % zinc is below against the default band [18, 10, 5, 2] %. Grade×width 0.7 %·m is below.
Negative factors
- 0.27 % zinc is below the weak threshold (2 %) on the default band.
- Scored from rubric bands during table expansion, not from document context.
Evidence · table
“0.27”
Context: SBM26-09
Tags used in scoring
QA/QC Disclosedpositive
Release includes QA/QC disclosure — certified lab, QP sign-off, or stated methods (blanks, standards, duplicates).
Why it applies: qaqc_disclosed is true
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
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.