Pampa Medina Drilling Returns 0.70% Copper Over 66 m in Basement Rock
Original announcement by cruxinvestor on
- Company
- Marimaca Copper
- Ticker
- MARI
- Exchange
- Unavailable
- Region
- Antofagasta Region, Chile
- Primary commodity
- Copper
- Secondary commodities
- Silver
- Document categories
- Drill results, Other
- Extracted
- 2026-09-03 11:05:17 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Step-out drilling at the Pampa Medina deposit in Chile has successfully intersected copper mineralization in the basement metamorphosed sediments for the first time. This discovery extends the prospective stratigraphy below the previously modeled host units, revealing a series of high-grade stacked mantos.
Reasoning: The drilling successfully expanded the target footprint into a previously unmodeled basement unit, significantly increasing the prospective vertical column of the deposit.
Positive factors
- Step-out drilling reached mineralization in basement metamorphosed sediments for the first time
- Extends the prospective stratigraphy beyond previously modeled host units
- High-grade stacked mantos observed
- Significant width in basement unit (66m)
Negative factors
- Post-mineralization dykes affecting some intervals
- Structural interference noted in southern hole
Facts used in scoring: 22
Classification and evidence
Step-Out Extensionpositive
Mineralization extended beyond the previously known limit.
Why it applies: Drilling reached copper in the basement rock below modeled host units for the first time, extending the prospective column.
Evidence · text
“Step-out drilling at Pampa Medina reached copper in the basement rock below its modeled host units for the first time, which extends the prospective column.”
Apparent Width Onlynegative
Interval given as downhole width with no true width or drill orientation — apparent width may overstate true thickness.
Why it applies: Reported intervals are downhole lengths, and true widths are estimated at approximately 80% of them.
Evidence · text
“Reported intervals are downhole lengths, and true widths are estimated at approximately 80% of them”
Extracted facts
Stored fact records: 22. Some facts used in scoring do not have a stored record.
Drill Results (22)
deepest holecopperGrade: 0.41Grade Unit: %Intercept: 660 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 0.41
- Grade Unit
- %
- Intercept
- 660 m
- From
- 386 m
- To
- 1046 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:386-1046
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Broad low-grade intercept through the sedimentary package.
Positive factors
- Broad envelope of mineralization
deepest holesilverGrade: 1.8Grade Unit: g/tIntercept: 660 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 1.8
- Grade Unit
- g/t
- Intercept
- 660 m
- From
- 386 m
- To
- 1046 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:386-1046
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Low-grade silver accompanying the broad copper envelope.
deepest holecopperGrade: 1.21Grade Unit: %Intercept: 98 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 1.21
- Grade Unit
- %
- Intercept
- 98 m
- From
- 386 m
- To
- 484 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:386-484
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Stronger grade intercept within the sedimentary package.
Positive factors
- Higher grade sheet within the broader envelope
deepest holesilverGrade: 7.6Grade Unit: g/tIntercept: 98 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 7.6
- Grade Unit
- g/t
- Intercept
- 98 m
- From
- 386 m
- To
- 484 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:386-484
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Silver grade tracking with copper.
deepest holecopperGrade: 2.9Grade Unit: %Intercept: 16 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 2.9
- Grade Unit
- %
- Intercept
- 16 m
- From
- 388 m
- To
- 404 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:388-404
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: High-grade intercept within the sedimentary package.
Positive factors
- High-grade sheet
deepest holesilverGrade: 21.2Grade Unit: g/tIntercept: 16 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 21.2
- Grade Unit
- g/t
- Intercept
- 16 m
- From
- 388 m
- To
- 404 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:388-404
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: High silver grade within the high-grade copper sheet.
deepest holecopperGrade: 0.7Grade Unit: %Intercept: 66 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 0.7
- Grade Unit
- %
- Intercept
- 66 m
- From
- 802 m
- To
- 868 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:802-868
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Key discovery intercept that expands the prospective stratigraphy.
Positive factors
- First time reaching basement metamorphosed sediments
- Significant width (66m)
Negative factors
- Post-mineralization dykes affected intervals
deepest holecopperGrade: 1.05Grade Unit: %Intercept: 14 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 1.05
- Grade Unit
- %
- Intercept
- 14 m
- From
- 834 m
- To
- 848 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:834-848
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Stronger grade within the basement unit.
Positive factors
- High-grade sub-interval
deepest holecopperGrade: 1.4Grade Unit: %Intercept: 6 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 1.4
- Grade Unit
- %
- Intercept
- 6 m
- From
- 862 m
- To
- 868 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:862-868
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: High-grade sub-interval in the basement.
Positive factors
- High-grade sub-interval
deepest holecopperGrade: 0.65Grade Unit: %Intercept: 34 mView all detailsHide details
Identity
- Hole ID
- deepest hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 0.65
- Grade Unit
- %
- Intercept
- 34 m
- From
- 930 m
- To
- 964 m
Classification
- Sample Type
- drill
- Group ID
- deepest hole:930-964
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Deep intercept continuing in the basement.
southern holecopperGrade: 1.26Grade Unit: %Intercept: 30 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 1.26
- Grade Unit
- %
- Intercept
- 30 m
- From
- 440 m
- To
- 470 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:440-470
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Strong intercept in the metamorphosed sediments.
Positive factors
- High-grade stacked sheets
Negative factors
- Intersected multiple barren dykes
southern holesilverGrade: 2.6Grade Unit: g/tIntercept: 30 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 2.6
- Grade Unit
- g/t
- Intercept
- 30 m
- From
- 440 m
- To
- 470 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:440-470
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Silver grade accompanying copper.
southern holecopperGrade: 2.34Grade Unit: %Intercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 2.34
- Grade Unit
- %
- Intercept
- 6 m
- From
- 440 m
- To
- 446 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:440-446
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: High-grade sub-interval.
Positive factors
- High-grade sheet
southern holesilverGrade: 10.7Grade Unit: g/tIntercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 10.7
- Grade Unit
- g/t
- Intercept
- 6 m
- From
- 440 m
- To
- 446 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:440-446
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: High silver grade in high-grade sheet.
southern holecopperGrade: 2.5Grade Unit: %Intercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 2.5
- Grade Unit
- %
- Intercept
- 6 m
- From
- 440 m
- To
- 446 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:440-446
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Second high-grade sheet in the stack.
Positive factors
- High-grade sheet
southern holesilverGrade: 2.3Grade Unit: g/tIntercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 2.3
- Grade Unit
- g/t
- Intercept
- 6 m
- From
- 440 m
- To
- 446 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:440-446
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Silver grade accompanying copper.
southern holecopperGrade: 0.85Grade Unit: %Intercept: 32 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 0.85
- Grade Unit
- %
- Intercept
- 32 m
- From
- 506 m
- To
- 538 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:506-538
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Moderate grade intercept.
southern holesilverGrade: 4.4Grade Unit: g/tIntercept: 32 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 4.4
- Grade Unit
- g/t
- Intercept
- 32 m
- From
- 506 m
- To
- 538 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:506-538
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Silver grade accompanying copper.
southern holecopperGrade: 0.77Grade Unit: %Intercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 0.77
- Grade Unit
- %
- Intercept
- 6 m
- From
- 940 m
- To
- 946 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:940-946
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Deep intercept in metamorphosed sediments.
southern holesilverGrade: 2Grade Unit: g/tIntercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 2
- Grade Unit
- g/t
- Intercept
- 6 m
- From
- 940 m
- To
- 946 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:940-946
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Silver grade accompanying copper.
southern holecopperGrade: 1.05Grade Unit: %Intercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- copper
- Ticker
- MARI
Geometry
- Grade
- 1.05
- Grade Unit
- %
- Intercept
- 6 m
- From
- 1006 m
- To
- 1012 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:1006-1012
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: Deep intercept in metamorphosed sediments.
southern holesilverGrade: 8.3Grade Unit: g/tIntercept: 6 mView all detailsHide details
Identity
- Hole ID
- southern hole
- Commodity
- silver
- Ticker
- MARI
Geometry
- Grade
- 8.3
- Grade Unit
- g/t
- Intercept
- 6 m
- From
- 1006 m
- To
- 1012 m
Classification
- Sample Type
- drill
- Group ID
- southern hole:1006-1012
Review
- Needs Review
- No
- Interp. Status
- scored
- Historical
- No
Dates
- Event date
- 2026-09-03T00:00:00.000Z
Reasoning: High silver grade in deep intercept.
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.