# Pampa Medina Drilling Returns 0.70% Copper Over 66 m in Basement Rock Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96 Original source: https://www.cruxinvestor.com/posts/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock Publisher: cruxinvestor Original announcement: 2026-09-03T00:00:00.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - 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 Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas 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 factor: Step-out drilling reached mineralization in basement metamorphosed sediments for the first time - Positive factor: Extends the prospective stratigraphy beyond previously modeled host units - Positive factor: High-grade stacked mantos observed - Positive factor: Significant width in basement unit \(66m\) - Negative factor: Post-mineralization dykes affecting some intervals - Negative factor: Structural interference noted in southern hole Facts used in scoring: 22 ## Classification and evidence **Step-Out Extension** Polarity: positive Definition: 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 Only** Polarity: negative Definition: 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-0) copper #### 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 factor: Broad envelope of mineralization ### deepest hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-1) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-2) copper #### 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 factor: Higher grade sheet within the broader envelope ### deepest hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-3) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-4) copper #### 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 factor: High-grade sheet ### deepest hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-5) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-6) copper #### 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 factor: First time reaching basement metamorphosed sediments - Positive factor: Significant width \(66m\) - Negative factor: Post-mineralization dykes affected intervals ### deepest hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-7) copper #### 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 factor: High-grade sub-interval ### deepest hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-8) copper #### 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 factor: High-grade sub-interval ### deepest hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-9) copper #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-10) copper #### 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 factor: High-grade stacked sheets - Negative factor: Intersected multiple barren dykes ### southern hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-11) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-12) copper #### 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 factor: High-grade sheet ### southern hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-13) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-14) copper #### 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 factor: High-grade sheet ### southern hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-15) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-16) copper #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-17) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-18) copper #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-19) silver #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-20) copper #### 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 hole [Link to this fact](https://atlas-staging.minestarters.com/news/pampa-medina-drilling-returns-0-70-copper-over-66-m-in-basement-rock--47e93966-6045-428a-b660-07d4396a2c96#fact-drill-facts-21) silver #### 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.