Just googled a little bit about gubong and found following data...

Just googled a little bit about gubong and found following data ( nothing new, but nice to read ) ;

"Gubong mine used to be the largest gold producer in South Korea from 1930-1943. Historic underground sampling results of the deeper levels of the Vein 6 set gives an arithmetic average of 30.71 g/t gold from 141 values. Exploratory core drilling below the now abandoned mine workings from one of five holes gave 27.9 g/t gold and 25 g/t silver over 1.6 metres from 845.2 metres. This demonstration of the persistence with depth of the most developed mineralised structure supports the prospectivity of the property for auriferous shoots with considerable depth continuity."


General
"The Gubong area is a significant orogenic gold mining district containing the historically 2nd largest gold mine in Korea with >400koz Au production; the tailings from this production have not been reprocessed and remain onsite in a rehabilitated Tailings Storage Facility , offering a potential early cashflow opportunity if appropriate permitting can be obtained."


https://mining-atlas.com/operation/Gubong-Gold-Mine.php