dplath_bio 2017-05-03T05:08:12+00:00

David Plath, Inventor of Cleangold

David Plath grew up in Portland, Oregon and attended Oregon State University where he received a BS in Chemistry in 1977 and a MS in Chemical Oceanography in 1979.

David worked for many years in the Public Utility Industry, including a Senior Chemist position with Portland General Electric specializing in chemical separations and microscopy and a position with Bonneville Power Administration specializing in high resolution gas chromatography and microscopy. He has also been a consultant, starting Scientific Investigators. Mr Plath is also a past chairman of the Portland section of the American Chemical Society.

In 1993 he moved to Lincoln City, Oregon where he began to pursue the research that would result, in 1999, in the issuance of a patent for the technology and process now known as Cleangold. The process and technology is now in use on every continent (except Antarctica) and is in use in placer, hard rock and alluvial mines. Work continues on the study of forces contributing to the development of placers on the beaches of Oregon. Of special interest is the recovery of high density minerals as secondary products for mining operations.

Projects with Cleangold include work in Suriname on a World Bank Development Marketplace won by Artminers. This work investigated the feasibility of implementing Cleangold technology to improve recovery of fine gold and mercury lost from alluvial sluice boxes as well as its use as a replacement for mercury with milled ores from hardrock mines. Following this work a project in Peru was undertaken for Artminers in cooperation with ACEER and ACCA (two Amazon conservation organizations) and the Peru Miners Association to introduce river dredging operations on the Madre de Dios River to Cleangold technology to improve primary recovery and replace the use of mercury in final recovery of gold from concentrates. Work with alluvial mines in Suriname and hard rock mines in both Suriname and Peru have shown recovery of gold as fine as 2500 mesh. Finally a project was done in China and was supported by Artminers and National Geographic’s Explorer program

Technical papers coauthored with Dr. Lars Hylander of the University of Uppsala, Sweden include:

Clean 2007,35(1),52-61 Comparison of Different Gold Recovery Methods with Regard to Pollution Control and Efficiency

Science of the Total Environment 368 (2006) 371-383 Microscopy and certification as tools for environmentally benign, mercury-free small-scale gold mining

For more information or to contact David, please use our SRP contact page or visit cleangold.com