Cornerstone Capital Resources Inc. provided 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. Highlights: Strong assay results received from six drill holes at Alba and four holes from the eastern end of the Brama system; Alba and Brama form part of the Bramaderos Project; Broad zones of gold-copper mineralization have been intersected, including sub-zones of higher grade; Significant results include: 49.45m1 at 0.60g/t AuEq2 (0.37g/t gold and 0.13% copper), from 392m in BMDD035 (Brama); 32m at 1.20g/t AuEq (0.87g/t gold and 0.20% copper), from 386m in BMDD036 (Alba); 115m at 0.66g/t AuEq (0.41g/t gold and 0.15% copper), from 12m in BMDD039 (Alba), including; 24.15m at 1.10g/t AuEq (0.46g/t gold and 0.38% copper), from 31.35m; 69m at 0.61g/t AuEq (0.36g/t gold and 0.14% copper), from 21m in BMDD043 (Alba); Drilling for the initial Mineral Resource Estimate has been completed but mineralization is open in several areas beyond the planned initial resource boundary; An Exploration Target will also be released in December to provide some guidance on opportunities to continue growing the scale of the Brama-Alba system; Exploration drilling has commenced at nearby porphyry targets Melonal, Sandia and Limon; The first hole has been completed at Melonal; Logging of the Sandia and Melonal holes indicate that they are altered and mineralized consistent with Brama porphyry type systems. Sunstone and Cornerstone announced more wide intersections with grades of plus-1g/t gold-equivalent which will further underpin the upcoming initial Mineral Resource Estimate (MRE) at their Brama-Alba porphyry discovery in southern Ecuador. They are also announced the resumption of discovery drilling at three other porphyry targets within the Bramaderos concession and report drilling at two of those targets has returned visible copper mineralization.

Sampling and Assaying: 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 1,000g portion by riffle or Boyd rotary splitter. The 1,000g 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 (AAS) 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 (MSA code FAS-415, FA, 30g., gravimetric finish). Soil samples are dried at low temperature, screened to 80 mesh (MSA code PRP-757); a 15 grams portion is then assayed for a multi-elements suite (MSA code IMS-136, Aqua Regia digestion, ICP-AES/MS finish).