Aura Minerals Announces the Results of the Preliminary Economic Assessment for the Era Dorada Project

Published: 2025-06-10 03:05:23 ET ORA.TO

Published on 06/10/2025 at 03:05

Aura Minerals Inc. announced that the Company has filed a preliminary economic assessment for the Company's wholly owned Era Dorada Project ("Era Dorada" or "Project", which project was previously known as the Cerro Blanco Project), in the United States in accordance with S-K 1300. In January 2025, Aura completed the acquisition of Bluestone Resources Inc. ("Bluestone"), which was the 100% owner of Era Dorada (or Cerro Blanco as it was known then), located in Jutiapa, Guatemala, near the town of Asuncion Mita and border with El Salvador. Highlights: Indicated Mineral Resources of 1.9 million ounces of gold, assuming 6.35 million tonnes at 9.31 grams per tonne.

Total production of approximately 1.4 million ounces of gold over a 17 years Life of Mine ("LOM"). The climate is tropical dry forest, with elevations of 450-560 masl, a wet season from May to October, 1,350 mm annual rainfall, temperatures ranging from 10degC to 41degC, 2,530 mm annual pan evaporation, and 62% average humidity. The site is near communities, including Asuncion Mita (18,500 population), and the La Baranca power substation (20 MW capacity) a few kilometers south.

No prior mining occurs in the area, but the closure of Goldcorp's Marlin Mine in 2017 provides access to trained Guatemalan labor. The project plans to hire locally, with training costs included in the budget. The Era Dorada was identified by Mar-West by sampling of densely silicified boulders.

In October 1998, Mar-West's holdings in Honduras and Guatemala were purchased by Glamis Gold Ltd. In November 2006, Goldcorp Inc. became the sole proprietor of the Project through the purchase of Glamis Gold. Exploration follows CIM Mineral Exploration Best Practice Guidelines (2019). The resource estimate by Garth Kirkham, P. Geo., conforms to CIM standards, with 130,307 gold assays (153,078 m, 0.68 g/t average) and 130,238 silver assays (153,003 m, 3.75 g/t average).

Bulk density is assigned by lithology and vein on a block-by-block basis. The estimate was completed using MineSight?? software using a 3D block model (5 m by 5 m by 5 m and 1 m by 1 m by 1 m sub-blocks).

Interpolation parameters have been derived based on geostatistical analyses conducted on 1.5-meter composited drill holes. Block grades have been estimated using ordinary kriging (OK) methodology and the mineral resources have been classified based on proximity to sample data and the continuity of mineralization in accordance with NI 43-101, CIM's " Definition Standards for Mineral Resources and Mineral Reserves" dated May 19, 2014, and "CIM Estimation of Mineral Resources and Mineral Reserves Best Practice Guidelines" dated November 29, 2019. Resource Estimateusing2.25gAu/tCut-off Resource Category Tonnes (kt) Au Grade (g/t) Ag Grade (g/t) Contained Silver (koz) Measured Indicated 6,349 9.31 31.54 1,901 6,439 Measured & Indicated 6,349 9,54 1,901 6,901 6,439 Inferred 605 6.02 19.68 383.