Figures related to this news release can be seen in PDF format by accessing the version of this release on the Company’s website (www.cornerstoneresources.com) or by clicking on the link below:
https://cornerstoneresources.com/site/assets/files/5870/nr22-23figures.pdf.
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
FURTHER INFORMATION:
Sunstone and Cornerstone are pleased to announce 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
They are also pleased to announce the resumption of discovery drilling at three other porphyry targets within the Bramaderos concession (Figure 2) and report drilling at two of those targets has returned visible copper mineralization.
All holes reported in this release for Brama-Alba intersected wide zones of gold-copper mineralization (Figure 1, Table 1).
Sunstone Managing Director
“These results are more evidence of the substantial widths of mineralization which will form part of the initial MRE.
“The MRE, which we expect to deliver in December will be the first step to building a significant inventory of gold and copper at Bramaderos. An Exploration Target will be estimated alongside the MRE to guide further drilling to increase the resource base at Bramaderos in 2023.
“In addition, the drilling of new targets to deliver further discoveries with the potential to significantly increase the resource base is now underway.
“We have a lot to deliver at Bramaderos during the remainder of 2022”.
About Bramaderos
Measuring 4,948 hectares, the Bramaderos project is ideally located immediately adjacent to the Pan American highway, and close to available hydropower, supporting the economics of potential development opportunities. The project is supported by nearby commercial airports and significant cities (Loja) and enjoys strong community support.
The Bramaderos concession is owned by
Cornerstone’s 12.5% interest is carried by Sunstone through to the start of commercial production and repayable at Libor plus 2% out of 90% of Cornerstone’s share of earnings or dividends from the Bramaderos project (see news release 20-01 dated
More information about the property can be found at www.cornerstoneresources.com.
Qualified Person
Sampling and Assaying
Surface and drill core samples from Brama were sent to the LAC y Asociados Cia. Ltda. Sample Preparation Facility in
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
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
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).
Quality Assurance / Quality Control (QA/QC)
MSALABS is a qualified assayer that performs and makes available internal assaying controls. Duplicates, certified blanks and standards are systematically used (1 control sample every 20-25 samples) as part of PLAMIN’s QA/QC program. Rejects, a 100 g pulp for each rock sample, are stored for future use and controls.
About Cornerstone
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Cautionary Notice:
This news release may contain ‘Forward-Looking Statements’ that involve risks and uncertainties, such as statements of Cornerstone’s beliefs, plans, objectives, strategies, intentions and expectations. The words “potential,” “anticipate,” “forecast,” “believe,” “estimate,” “intend”, “trends”, “indicate”, “expect,” “may,” “should,” “could”, “project,” “plan,” or the negative or other variations of these words and similar expressions are intended to be among the statements that identify ‘Forward-Looking Statements.’ Although Cornerstone believes that its expectations reflected in these ‘Forward-Looking Statements’ are reasonable, such statements may involve unknown risks, uncertainties and other factors disclosed in our regulatory filings, viewed on the SEDAR website at www.sedar.com. For us, uncertainties arise from the behaviour of financial and metals markets, predicting natural geological phenomena and from numerous other matters of national, regional, and global scale, including those of anti-mining sentiment in certain regions of
On Behalf of the Board,
President and CEO
Neither
1 True widths of drill intercepts cannot be accurately estimated at this time. Sunstone is working on a geological model following which they expect to be able to estimate true widths.
2 The gold equivalent calculation formula is AuEq(g/t) = Au(g/t) + Cu% x 1.7. The prices used were
Source:
2022 GlobeNewswire, Inc., source