10 Geochemistry and Mineralogy (Posters)

Sunday, 22 March 2026
8:00 AM - 12:00 PM
CCC, Ballroom C

Geological Assessment and Comparisions of the Triassic Piuntza-Jurassic Zamora Bathlith Mineral Complex Guayzim Alto Concession to the La Zara Concession Fruta del Norte And Nambiji Gold Deposits Ecuador

Paper number: 10-10
Program: Technical Sessions
Time: 8:00 AM – 8:00 AM

Authors

Abstract

Zamora-Chinchipe Province, Ecuador is the center of the 120-km-long, NNE-SSW trending Corriente Copper-Gold Belt,, located at the western margin of the Amazon craton a significant frontier for high-quality mineral deposits part of the Andean Cordillera del Condor, featuring epithermal gold-silver ( Fruta del Norte ( FDN) and Nambija). .

The purpose of this presentation is to review the  gold geology of the Guayzim  Alto concession.with a comparrative analogous models of Fruta del Norte  and Nambija  gold mines.  This presentation is based upon Volcan Holdings attained  reports (1990, 1995, 2024), 6893 m of cores, 2000 m underground mine samples ,25000 geochemical assays, geological maps and cross sections and the NI-43-101 report  ( 2016) of FDN  .Volcan Mining Company  is reactivating the mining operations.

   Guayzim is  underlain by crystal – lithic and welded tuffs, ash, massive volcanic flows, flow breccia’s, and sedimentary rocks .Geological mapping  demonstrate 4 major skarn deposits in the proximity of the Zamora Batholith. Normal( extensional) fault networks created by metasomitism,  increased structural competency ,for hydrothermal fluids transportation. Emicrothermometric data Th from 513°C to 318°C and salinity from 1.0 to 23 wt.% eq. NaCl and δ18O values between 6.2‰ and 11.5‰ for gold-bearing milky quartz from the retrograde stage suggest that the ore-forming fluid was dominantly magmatic.

 3-d models of the  Guyazimi  central deposit and FDN are comparable . Target areas  are where north – south mineralized faults intersect east – west (90°) and N70°E (70°) as well as N55° W (125°) zones of quartz –sulphide stock work veining and faulting

Reserve estimates from the top 200 m  ,4 areas of Skarn deposits contain  1)  Guayzimi Central Skarn body ( 17 cores, Au  6.13 g/t ) 134,490 Au oz., 40000 oz. Au  previously mined with 50000 Au oz. remaining, 2)La Escondida Skarn( 4 core holes Au 1.81 g/t )151000 oz. Au,  3) Cerro-Banderas – Minanca ( 7 core holes Au  2.14 g/t) 165000 oz. Au. 4) Western Skarn ( 3 core holes  Au .314 g/ t ) 12,246 oz Au totaling 462000 oz. Au resources .

  Geological cross-sections demonstrate four  areas ( depth 200-700m) of significant upside gold potenital , 1) Central Skarn deposit, 2)  La Esconndida,  3)Quebrada Grandillas and 4) Cerro- Banderas , where extensive quartz– sericite - Kfeldspar – pyrite alteration  occurring in creeks, suggest the existence of a porphyry style phyllic alteration  

Geological Society of America Abstracts with Programs. Vol. 58, No. 2

doi: 10.1130/abs/2026NE-411105

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