Tailings Remediation Action Plan (TRAP) Overview

👉 Manipueira Prototype Plant Schematics and Design Specification -
                  Gold Toll Milling - Coexistence Model Explained

Our TRAP Innovation is designed to eliminate mercury use in ASG miner's ore processing and toxic cyanide salts used in tailings minerals reclamation with the use of bitter cassava plant extract as a lixiviant for the 1st time in the mining industry to safely and sustainably leach more gold from ore than by using mercury amalgamation.

Using cassava plant extract as a lixiviant was an idea developed by Dr. Marcello Veiga P. Eng., (whom I quote throughout this description), Professor Emeritus University of British Columbia Norman B. Kevil Institute of Mining Engineering who along with Pariya Torkaman, conceived and coordinated the experiments combining conventional mechanical processes using gravity and centrifugal force to capture fine gold concentrate after milling, or from tailings ponds waste.


This data is detailed in their Publication “Leaching gold with cassava: An option to eliminate mercury use in artisanal gold mining”,


The use of cassava is proven and scientifically documented to recover more gold safely and sustainably than mercury amalgamation.


Bitter cassava, a cyanogenic plant is common in many Latin America ASG mining areas and is used to manufacture flour  “manipueira” and make tapioca which in Brazil, is used to make beer.


“Bitter cassava has been sustaining millions of people in the world who produce flour”.


According to P. Torkaman et al, when crushed “the cassava plant liquid extract contains hydrogen cyanide generated from the hydrolysis of non-toxic cyanogenic glycosides which are substances intrinsically”. “These plants do not contain cyanide, but they generate it as a defense mechanism to intruders”.


“The free cyanide expelled liquid from the bitter cassava plant represents 30 – 40% of the root weight representing 267 milligrams of free cyanide per liter of extract. The indigenous name for this fluid is “manipueira” in Brazil which is recklessly disposed of on the ground around the mills, and when fermented, creates a nasty odor, and attracts insects.”


“Flour mills face a serious problem of disposing large amounts of “manipueira” (300 liters/tonne of the root)”


“The symbiosis of artisanal flour producers with artisanal gold miners can be an environmental win-win solution to reduce pollution from both sides.”

Subscribe to Our Site

Thanks for submitting!