Indonesian presenters for the approaching WORLD GOLD conference 2025 in the USA.

Congratulations to J.?Swandi and M.?Andra and V.?Veriyadi for presenting papers in the approaching World Gold conference to be held on the 25th February in the USA.

WORLD GOLD; ADVANCES IN GEOMETALLURGY; 25 February 2025 at 3:05 PM

Epithermal Au Ag Cu mineralization of the Bonanza Rek Rinti Vein System, Indonesia

J.?Swandi and M.?Andra; Technical, Micromine Indonesia, Jakarta, DKI Jakarta, Indonesia

Woyla gold district is located on the West Sunda Magmatic arc, known to host world class copper gold silver mineralization. This study examines the characteristics of the NE-SW trending epithermal quartz veins including mineral paragenesis, ore forming mechanism to resource potential. The paragenetic of Rek Rinti vein is classified into four stages: stage 1 – fluidize quartz-carbonate veinlets; stage 2 - quartz Mn carbonate breccia; stage 3 massive quartz; stage 4 – colloform crustiform to cockade quartz-carbonate. Stage 1 featuring greyish quartz+ anhedral pyrite. Stage 2 consists of dark greyish quartz+ chalcopyrite and arsenopyrite replacing early pyrite. Stage 3 is associated with massive white quartz+ chalcedony+ sphalerite with minor pyrite. Stage 4 introduces copper sulfide such as covellite embracing the previous chalcopyrite remnant, native gold occurring with ginguro. Sphalerite composition ranges from 26.70 to 14.35 mol % FeS in stage 3 and 10.25 to 4.40 mol % FeS in stage 4. Recent fire assay results is 81 g/t Au and 734 g/t Ag, with grab sampling result of 131 g/t Au, 1.508 g/t Ag, 4.84 % Zn, 0.8 % Pb and Cu. Keywords: Woyla gold district, Epithermal vein, Quartz, Stages

WORLD GOLD; ENHANCING EXTRACTION 1 ;25 February 2025 at 2:25 PM

Gold Price Forecasting using a novel hybrid model with ANN, WOA and Chaotic Sine Map Model

V.?Veriyadi; Mining, Grabuma, Damar, Indonesia

Gold is one of the most important products for global investors. The best gold forecasting performance can increase the confidence of global investors. The existing study, however, has failed to address gold price fluctuations that can affect the forecasting accuracy. Therefore, this study proposes the hybrid model that it combines the artificial neural network (ANN) model and the whale optimization algorithm (WOA) model with a chaotic sine map random analysis. The ANN weights are optimized using the WOA model that can improve the accuracy of the ANN model in forecasting gold prices. In order to enhance an accuracy in forecasting gold prices, the random value from an original WOA model is optimized using the chaotic sine map model. This model can improve the ANN with an original WOA model in forecasting gold prices 11% and 54% than the classic ANN mode.