Cornerstone Capital Resources Inc. provide an update on its Bramaderos gold and copper joint venture in southern Ecuador in which it has a 12.5% interest carried by JV partner and project operator Sunstone Metals Ltd. through to the start of commercial production. Results from hole BMDD022 now include the extension of the original hole that ended in mineralization. The extension added an additional 106m down-hole of gold-copper mineralized rock.

The hole was drilled at a low angle and therefore has significantly broadened the gold-copper porphyry deposit near surface. Drill hole BMDD024 was drilled southwest of the main target area during a period when electrical geophysics was being completed over the main target zone, precluding drilling in the target area. Significantly, BMDD024 intersected a narrow massive sulphide zone that also contained gold, suggesting potential for high-grade roots of epithermal veins also over-printing porphyry mineralization in the area.

BMDD025 was drilled below hole BMDD023 (which intersected 84.2m at 0.51g/t gold and 0.16% copper from 183m, within 222.4m at 0.37g/t gold and 0.13% copper from 76.4m). BMDD025 has added nearly 200m of additional vertical extent to this well mineralized system below BMDD023. Drill hole BMDD027 has further tested this vertical extent a further 100-250m below BMDD025 on this section.

This additional drilling is adding to the scale of the system which now measures at least 300m in diameter and a vertical extent exceeding 400m (and potentially up to 1,000m based on geophysics. Surface and drill core samples from Brama were sent to the LAC y Asociados Cia. Ltda.

Sample Preparation Facility in Cuenca, Ecuador for sample preparation. The standard sample preparation for drill core samples (Code PRP-910) is: Drying the sample, crushing to size fraction 70% <2mm and splitting the sample to a 1000g portion by riffle or Boyd rotary splitter. The 1000g sample is then pulverised to >85% passing 75 microns and then sent to the MSALABS in Langley, BC, Canada for gold and base metal analysis.

PLAMIN uses a fire assay gold technique for Au assays (FAS-111) and a four acid multi element technique (IMS-230) for a suite of 48 elements. FAS-111 involves Au by Fire Assay on a 30-gram aliquot, fusion and atomic absorption spectroscopy at trace levels. IMS-230 is considered a near total 4 acid technique using a 0.25g aliquot followed by multi-element analysis by ICP-AES/MS at ultra-trace levels.

This analysis technique is considered suitable for this style of mineralization. Standards, blanks and duplicates are inserted ~1/28 samples. The values of the standards range from low to high grade and are considered appropriate to monitor performance of values near cut-off and near the mean grade of the deposit.

The check sampling results are monitored and performance issues are communicated to the laboratory if necessary. Sample security was managed through sealed individual samples and sealed bags of multiple samples for secure delivery to the laboratory by permanent staff of the joint venture. MSALABS is an internationally accredited laboratory that has all its internal procedures heavily scrutinized in order to maintain their accreditation.

MSALABS is accredited to ISO/IEC 17025-2017 Accredited Methods and certified to ISO 9001-2015. PLAMIN's sampling techniques and data have been audited multiple times by independent mining consultants during various project assessments. These audits have concluded that the sampling techniques and data management are to industry standards.

All historical data has been validated to the best degree possible and migrated into a database. Rock samples are collected by PLAMIN's personnel, placed in plastic bags, labeled and sealed, and stored in a secure place until delivery by PLAMIN employees to the LAC y Asociados ISO 9001-2015 certified sample preparation facility in Cuenca, Ecuador. Rock samples are prepared crushing to 70% passing 2 mm (10 mesh), splitting 250 g and pulverizing to 85% passing 75 microns (200 mesh) (MSA code PRP-910).

Prepared samples are then shipped to MSALABS, an ISO/IEC 17025-2017 Accredited Method company and ISO 9001-2015 laboratory in Langley, BC, Canada, where samples are assayed for a multi-element suite (MSA code IMS-136, 15.0 g split, Aqua Regia digestion, ICP-AES/MS finish) and gold by Fire Assay (MSA code FAS-111, 30 g fusion, AAS finish). Over limit results for Cu (>1%) are systematically re-assayed (MSA code ICF-6Cu, 0.2 g, 4-acid digestion, ICP-AES finish). Gold is assayed using a 30 g split, Fire Assay (FA) and AAS finish (MSA code FAS 111).

Over limit results for Au (>10 g/t) are systematically re-assayed.