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Sonoro Gold Corp
Symbol SGO
Shares Issued 85,077,285
Close 2021-03-03 C$ 0.19
Market Cap C$ 16,164,684
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Sonoro recovers 80.3% Au from Cerro bottle roll testing

2021-03-03 11:09 ET - News Release

Mr. Kenneth MacLeod reports

SONORO GOLD CORP. REPORTS BOTTLE ROLL TESTS OF CERRO CALICHE MINERALIZATION RETURN AVERAGE RECOVERIES OF 80.3% FOR GOLD

Sonoro Gold Corp. has released the bottle roll results from its Cerro Caliche property in Sonora, Mexico. The samples tested were from four specific mineralized zones -- Japoneses, Cuervos, El Colorado/Cabeza Blanca and Buena Suerte -- and included associated composites. The testing was conducted at McClelland Laboratories Inc. in Sparks, Nev., as part of a detailed scope of work consisting of 43 bottle roll tests over 96 hours at a coarse sizing of 80 per cent -- 1.7-millimetre feed size. Subsequent leach recoveries averaged 80.3 per cent for gold and 27.2 per cent for silver. Sodium cyanide consumption rates averaged 0.20 kilogram per tonne (kg/t) and lime addition averaged 2.1 kg/t for the bottle roll tests at varying feed grades. These recoveries are similar in all structures and domains while cyanide consumption, which averaged 0.2 to 0.3 kg/t, together with the amount of lime required for pH control (approximately two kg/t), are well within acceptable levels.

The leaching profile indicated a fast recovery over the 24 hours for gold, with a slower profile for silver as expected.

The samples tested were from over 5,500 kilograms of mineralized material taken from 10 85-millimetre-diameter PQ core holes which were drilled to depths ranging from 25 to 140 metres. The balance of the mineralized material is being used for the column leach tests at McClelland Laboratories.

Drilling at Cerro Caliche has shown that the mineralization throughout the various zones is oxidized to the full extent of all the drill holes. Bottle roll test results verify previous observations that mineralization characteristics of near-surface oxidized drill cuttings were similar to the deeper oxidized mineralization.

Sonoro's vice-president of operations, Jorge Diaz, stated: "We are pleased with these results as it shows the mineralization is amenable to cyanide leaching and provides good recoverability at a coarse mesh bottle roll of 1.7 mm. We are also encouraged by the fact that these bottle roll tests, which were conducted on various ore types and across various zones within the property, demonstrate similar positive metallurgical recoveries across the entire resource area."

Sonoro's president and chief executive officer, Kenneth MacLeod, added: "The successful completion of these tests is an important advancement of the Cerro Caliche project and will contribute towards the completion of the NI 43-101 PEA that is expected to be released during Q3 2021. The results validate the projected 72-per-cent recovery rate used in the company's July 26, 2019, NI 43-101 technical report which provided the project's initial mineral resource estimate."

As previously planned, based on the bottle roll composites, the column testwork has now commenced at McClelland Laboratories. The column testing consists of 17 columns on nine mineralized zones and eight composites on two crush sizes of two-inch to 0.5-inch feed sizes. The company expects these column tests to run for up to 90 days and will report the results as they become available. Sonoro's chairman, John Darch, concluded: "The importance of this independent confirmation of the gold recoveries which now form the basis of our assessment of a 20,000-tonne-per-day heap leach mining operation cannot be understated as they are a critical milestone with regard to the project's advancement. That these bottle roll test results are very much in line with management's assumed recoveries speak volumes as to the acumen, professionalism and best-in-class practices employed by the Sonoro team."

Quality assurance/quality control (QA/QC) measures and analytical procedures

The PQ drill cores for metallurgical testing were drilled to normal industry standards, with the cores sequentially placed in four-row plastic core boxes, then kept in secure storage and packed onto wooden pallets prior to shipping to McClelland Laboratories Inc. by DHL.

No QA/QC issues were noted with the results received from the laboratory. McClelland Laboratories maintains accreditation with ISO/IEC standard 17025:2017, for fields of testing that include the fire assay and solution analyses used for the current metallurgical testing program.

Geologic description

Cerro Caliche is located 45 kilometres east southeast of Magdalena de Kino in the Cucurpe-Sonora megadistrict of Sonora, Mexico. Multiple historic underground mines were developed in the concession, including Cabeza Blanca, Los Cuervos, Japoneses, Las Abejas, Boluditos, El Colorado, Veta de Oro and Espanola. Mineralization types of the Cucurpe-Sonora megadistrict include variants of epithermal low-sulphidation veins and related mineralized dikes and associated volcanic domes. Local altered felsic dikes cut the mineralized metasedimentary rock units and may be associated with mineralization both in the dikes and metasedimentary rocks.

Host rocks include Jurassic-Cretaceous metasedimentary rock units, including argillite, shale, quartzite, limestone, quartz pebble conglomerate and andesite. Younger intrusive rock consisting of medium coarse-grained granodiorite granite is present in the westerly parts of the concessions near the historic Cabeza Blanca mine. It is apparent that veining cuts and pervasively alters the intrusive stock. Rhyolite occurs in irregular bodies distributed in higher elevations in the northerly part of the concession, including the Rincon area, where it occurs as flows, sills, dikes and rhyolite domes. Part of the rhyolite is mineralized and appears to be related to epithermal gold mineralization throughout the property.

Qualified person statement

Stephen Kenwood, professional geoscientist, a director of Sonoro, is a qualified person within the context of National Instrument 43-101 and has read and approved this news release. Readers are cautioned that the presence of mineralization on historic mines adjacent to or on Cerro Caliche is not necessarily indicative of gold mineralization in the concessions held by the company.

About Sonoro Gold Corp.

Sonoro Gold is a publicly listed exploration and development company with a portfolio of exploration-stage precious metal properties in Sonora, Mexico. The company has highly experienced operational and management teams with proven records for the discovery and development of natural resource deposits.

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