Peter Appel (Geological Survey of Denmark and Greenland) and Leoncio D. Na-Oy (Emerald Small Scale Miners Multi Purpose Cooperative) were twice invited to Kalimantan (Indonesia) to present the mercury-free gold extraction method.

First visit was to central Kalimantan with a large concentration of small-scale gold miners exploiting hard rock gold ores. This project was unfortunately not successful. The process did not work at all. A talk with a mining engineer in a nearby large scale commercial mine explained that they had severe beneficiation problems with their gold ore. Most of the gold appeared to be enclosed as small grains in argentite or appeared as auriferous argentite.

Second visit to Kalimantan was successful. The gold ore exploited was from a deeply weathered gold quartz vein system with fairly coarse gold grains. The miners showed genuine interest in adopting the mercury-free method. The demonstrations were carried out in 2011 and 2012.

In 2013 a small project was carried out in the Aceh province of Sumatra. It was financed by local sources and proved that the mercury-free gold extraction method works successfully on the gold ores of that area.