GoldMining (NYSE: GLDG) launches 1,200 m drill program at Yarumalito
Filing Impact
Filing Sentiment
Form Type
6-K
Rhea-AI Filing Summary
GoldMining Inc. has started a 2026 exploration core drilling program at its 100%-owned Yarumalito gold-copper project in Colombia’s Mid Cauca belt. The work tests a refined geological model focused on the P-1 intrusive host unit and nearby epithermal veins.
The existing mineral resource estimate at Yarumalito totals 66.3 million tonnes at 0.58 g/t gold and 0.09% copper, for 1.23 million ounces of inferred gold and 129 million pounds of inferred copper, based on about 18,000 m of historical core drilling. The new program plans approximately 1,200 m in three porphyry-focused holes plus a fourth hole targeting mapped epithermal veins.
Positive
- None.
Negative
- None.
Key Figures
Inferred gold resource: 1.23 million ounces Au
Inferred copper resource: 129 million pounds Cu
Resource tonnage: 66.3 million tonnes
+5 more
8 metrics
Inferred gold resource
1.23 million ounces Au
Estimated inferred mineral resources at Yarumalito
Inferred copper resource
129 million pounds Cu
Estimated inferred mineral resources at Yarumalito
Resource tonnage
66.3 million tonnes
Tonnage in existing Yarumalito mineral resource estimate
Gold grade
0.58 g/t Au
Average gold grade in existing Yarumalito resource
Copper grade
0.09% Cu
Average copper grade in existing Yarumalito resource
Historical drilling length
18,000 m core
Approximate historical drilling used for the mineral resource estimate
Planned 2026 drilling
1,200 m core
Approximate length of planned 2026 exploration drilling program
Historical drill holes
50 holes
Number of drill holes underpinning the existing Yarumalito resource
Key Terms
inferred mineral resources, National Instrument 43-101, epithermal veins, porphyry-style mineralization, +1 more
5 terms
inferred mineral resources financial
"129 million pounds Cu of estimated inferred mineral resources."
An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.
National Instrument 43-101 regulatory
"qualified person as defined in National Instrument 43-101 – Standards of Disclosure"
National Instrument 43-101 is a set of rules and guidelines that govern how mineral exploration and mining companies must report information about their projects. It ensures that the details shared with investors are accurate, consistent, and reliable—similar to how a detailed, verified blueprint ensures a building’s safety. This helps investors make informed decisions based on trustworthy information about a company's mineral resources.
epithermal veins technical
"epithermal veins containing pyrite, galena, sphalerite and chalcopyrite."
Epithermal veins are narrow, mineral-rich seams formed when hot, mineral-bearing fluids move through cracks near the Earth’s surface and cool, leaving behind concentrated layers of metals such as gold and silver. For investors, these features matter because they can indicate a high-grade, potentially mineable deposit close to the surface—comparable to finding a concentrated streak of ore in a rock that can greatly boost a mining project's value and lower extraction costs.
porphyry-style mineralization technical
"test the geometry and extents of the porphyry-style of mineralization in the ‘P-1’ intrusive phase"
Porphyry-style mineralization is a type of large, spread-out deposit where metals such as copper, gold and molybdenum are dispersed through a volume of rock around an intrusive body. Think of it like a vast field with many small grains of metal rather than a single rich vein. Investors care because these deposits can support long-lived, high-volume mining operations with steady output and predictable costs, making them attractive for large-scale resource development.
Mid Cauca Au-Cu Belt technical
"located in the Mid Cauca Au-Cu Belt of central Colombia"
FAQ
What did GoldMining Inc. (GLDG) announce in this 6-K filing?
GoldMining Inc. announced it has begun a 2026 exploration core drilling program at its 100%-owned Yarumalito gold-copper project in Colombia, aiming to test a refined geological model and expand understanding of the main mineralized host unit and associated epithermal veins.
How large is the current mineral resource at GoldMining’s Yarumalito project?
Yarumalito’s existing mineral resource estimate comprises 66.3 million tonnes grading 0.58 g/t gold and 0.09% copper. This equates to an estimated 1.23 million ounces of inferred gold and 129 million pounds of inferred copper based on historic drilling between 2005 and 2013.
What is the scope of GoldMining’s 2026 drilling program at Yarumalito?
The 2026 program plans approximately 1,200 metres of core drilling across three holes targeting porphyry-style mineralization in the P-1 intrusive phase. A fourth drill hole will test mapped epithermal veins from old underground workings to assess their geometry, width, and grade characteristics.
Where is the Yarumalito gold-copper project located in Colombia?
Yarumalito lies in the Mid Cauca Au-Cu Belt of central Colombia, about 105 kilometres south-southwest of Medellín and 40 kilometres south of GoldMining’s La Mina project. Nearby projects include Aris Mining’s Marmato mine and Collective Mining’s Guayabales project.
What geological style of mineralization is present at Yarumalito?
Gold-copper mineralization at Yarumalito is mainly porphyry-style within potassic-altered diorite intrusions hosting disseminated and fracture-controlled sulphides. This is overprinted by structurally controlled intermediate sulphidation epithermal veins containing minerals such as pyrite, galena, sphalerite and chalcopyrite.
Who is the qualified person for the technical information on Yarumalito?
Tim Smith, GoldMining’s VP Exploration, is the qualified person responsible for the scientific and technical information on Yarumalito. He meets the definition of a qualified person under Canada’s National Instrument 43-101, which governs public mineral project disclosure standards.

