SIERRA METALS CONFIRMS NORTHERN EXTENSION OF THE BOLIVAR NORTHWEST OREBODY CONTAINING AN AVERAGE GRADE OF 1.37% COPPER AND AN AVERAGE TRUE WIDTH OF 8.1 METERS AT THE BOLIVAR MINE, MEXICO ________________________________________

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Toronto, ON – June 6, 2018 – Sierra Metals Inc. (TSX: SMT) (BVL: SMT) (NYSE
AMERICAN: SMTS) (“Sierra Metals” or “the Company”) today announces results of an infill drilling program evaluating the continuity and characteristics of geophysical anomalies that were previously tested as part of a recent Titan 24 Geophysical Survey and deemed high value targets at the Bolivar Property, Chihuahua, Mexico. The Bolivar Property is situated within the Piedras Verdes Mining District, which is located within the major north-northwest trending Sierra Madre Precious Metals Belt extending across the states of Chihuahua, Durango and Sonora in northwestern Mexico.

ALMADEN EXPLORATION DRILLING HITS 26.00 METERS OF 1.93 G/T GOLD INCLUDING 1.00 M OF 27.50 G/T GOLD APPROXIMATELY 1.2 KM SOUTH WEST OF PFS PIT AT THE IXTACA PROJECT MEXICO

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VANCOUVER, British Columbia, May 31, 2018 (GLOBE NEWSWIRE) — Almaden Minerals Ltd. (“Almaden” or “the Company”) (TSX:AMM) (NYSE American:AAU) is pleased to announce further assay results from Almaden’s ongoing exploration and development program at the Company’s Ixtaca gold-silver project, Mexico.

Colibri Resource Corporation Announces Second Batch Results from Drilling at Pilar Gold Project

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DIEPPE, N.B., May 31st, 2018 (CBI: TSX-V) – Colibri Resource Corporation (“Colibri” or the “Company”) wishes to announce assay results from 16 more holes completed on its Phase 1 reverse circulation (RC) drilling program on its 100% owned Pilar Gold Project in Sonora, Mexico.  Results include an intersection of 5.37 grams per tonne (g/t) Au over an intersection length of 3.0 meters (m) in hole JES-18-19 which was part of a longer intersection of 40.5m of 0.73 g/t.

Alio Gold Completes Surface Drilling Program at Ana Paula

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VANCOUVER, British Columbia, May 30, 2018 (GLOBE NEWSWIRE) — Alio Gold Inc (TSX:ALO) (NYSE AMERICAN:ALO) (“Alio Gold” or the “Company”), is pleased to provide the final set of drill results from its surface drill program at its 100%-owned Ana Paula project in Guerrero, Mexico. The 3,800 metre surface diamond drill program was initiated in January 2018 and consisted of six drill holes of 600 to 700 metres each targeting the complex breccia extension below the proposed open-pit. Additionally, two 300 metre surface holes were drilled into the near surface hydrothermal breccia to test its southern extension.

DISCOVERY METALS REPORTS ADDITIONAL HIGH-GRADE CHANNEL SAMPLES FROM PUERTO RICO PROJECT, AVERAGING 182 G/T SILVER, 8.6% ZINC AND 3.0% LEAD IN MANTO MINERALIZATION ACROSS ZARAGOZA GRANDE LEVEL

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May 24, 2018 – Discovery Metals Corp. (TSX-V: DSV) (“Discovery” or the “Company”) is pleased to announce a second batch of assays results from the detailed underground channel sampling program at its flagship Puerto Rico project (“Puerto Rico” or “the Project”) in northern Coahuila State, Mexico. This follows up on the first batch of results released on April 30, 2018 (see References below for link).

Prospero Closes First Tranche of Private Placement Financing

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Vancouver, British Columbia–(Newsfile Corp. – May 23, 2018) – Prospero Silver Corp. (TSXV: PSL) (“Prospero” or “The Company”) is pleased to announce that on May 18, 2018, it completed a private placement of $517,479.98 which was previously announced on April 16, 2018. The Company also began the process of closing the second tranche today which it intends to close within the next five business days, for additional proceeds of approximately $495,000.

GOLDPLAY EXPLORATION ANNOUNCES DRILLING START ON THE EL HABAL PROPERTY, MEXICO

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May 22, 2018, Vancouver, BC – Goldplay Exploration Ltd. (TSXV: GPLY – the “Company” or “Goldplay”), is pleased to announce that the phase I drilling program has started on the El Habal Property in Sinaloa, Mexico. The phase I core drill program will include six drill holes in the Santos and La Reina targets totaling an estimated 1,500 meters.