Plant-derived extraction systems replacing toxic chemical processes.
Mercury-Free Botanical Gold Recovery
Chemical mechanism detailing how plant-derived ligands enable gold complexation, solubilization, and recovery under controlled conditions without the use of mercury or synthetic cyanide systems.
Real-world implementation of botanical extraction chemistry across processing systems
Extraction Systems - Case Applications
Applied case studies demonstrating how botanical lixiviant systems translate solution chemistry principles into efficient, low-toxicity gold extraction and scalable processing performance.
Manipueira advances safe, sustainable gold recovery, reduces neurotoxic exposure, and promotes circular-economy practices.
Manipueira Gold Recovery Technology
A plant-derived lixiviant system demonstrating high-efficiency gold recovery through controlled ligand chemistry, reduced toxic exposure, and integration of agricultural byproducts into scalable extraction processes.
In 2021, Manipueira Gold Recovery Technology, Inc. was founded in British Columbia to solve one of mining’s most persistent problems: the toxic use of mercury and synthetic cyanide in gold extraction. The company developed a four-stage, ESG-aligned, plant-based leaching system that replaces these hazardous chemicals with a naturally derived alternative.
At the core of this innovation is manipueira—a liquid by-product of the bitter cassava plant (Manihot esculenta). While traditionally treated as waste, manipueira contains naturally generated cyanide ions released only when the plant’s cellular structure is disrupted. Importantly, the plant itself does not store free cyanide; it is produced through a controlled biochemical reaction, offering a fundamentally different and more sustainable pathway for gold recovery.
This breakthrough reframes agricultural waste as a high-value chemical system—unlocking safer extraction, reduced environmental impact, and scalable solutions for artisanal mining.
Demonstrates how botanical chemistry enables cross-sector integration between agriculture and mineral processing
Conversion of a 50-tonne-per-day mercury-based amalgamation facility to Manipueira
Agricultural outputs (cassava processing byproducts such as manipueira) are repurposed as functional extraction agents for gold recovery. This closed-loop framework reduces reliance on toxic reagents, minimizes waste streams, and creates parallel economic pathways for agricultural and mining communities.
In 2025, the company published a four-stage, ESG-aligned transformational Action Plan—complete with process schematics—demonstrating the conversion of a 50-tonne-per-day mercury-based amalgamation facility into a Manipueira Precious Metals Leaching Center. This model establishes a scalable, circular system linking artisanal ore processing with cassava-derived lixiviant production.
The result is a closed-loop, circular-economy framework that supports environmentally responsible gold recovery, reduces toxic exposure, and improves community-level economic outcomes.
As global demand accelerates for cleaner, compliant mining technologies, Manipueira represents a compelling investment opportunity—combining strong financial potential with measurable environmental and public health impact.
Demonstrates how botanical chemistry enables cross-sector integration between agriculture and mineral processing.
Manipueira: The Power of Green Gold Recovery
A high-performance botanical extraction system demonstrating how cassava-derived lixiviants enable efficient gold recovery, reduce environmental toxicity, and establish scalable circular-economy processing models.
Figure. Performance Comparison of Botanical Lixiviant vs Mercury-Based Gold Extraction.
Comparative analysis of gold recovery efficiency, toxicity profile, and environmental impact between plant-derived lixiviant systems (manipueira) and conventional mercury-based extraction methods.
A circular systems model linking artisanal ore processing with cassava-derived lixiviant production. Agricultural outputs (cassava processing byproducts such as manipueira) are repurposed as functional extraction agents for gold recovery. This closed-loop framework reduces reliance on toxic reagents, minimizes waste streams, and creates parallel economic pathways for agricultural and mining communities. The model supports environmental remediation, reduced toxin exposure, and improved socio-economic outcomes.
Figure. Process Chemistry Layer — Botanical Lixiviant Extraction Mechanism.
This figure illustrates the underlying chemical mechanism of botanical gold extraction using manipueira-derived compounds. Organic acids and plant-based ligands interact with gold surfaces to form soluble complexes, enabling controlled recovery without mercury or cyanide.
Figure. Manipueira-based botanical extraction system demonstrating plant-derived lixiviant chemistry enabling mercury-free gold recovery with reduced environmental toxicity and circular resource integration.
“The symbiosis of artisanal ore processors and flour makers is a win-win situation to reduce environmental pollution, health threats, and mitigating an unintended consequence of harvesting the bitter cassava plant” (P. Torkaman et al., 2021).
Integrated Circular System: Cassava Processing and Botanical Gold Recovery
Global Cassava Production Systems and Strategic Supply Regions
A circular systems model linking artisanal ore processing with cassava-derived lixiviant production. Agricultural outputs (cassava processing byproducts such as manipueira) are repurposed as functional extraction agents for gold recovery. This closed-loop framework reduces reliance on toxic reagents, minimizes waste streams, and creates parallel economic pathways for agricultural and mining communities. The model supports environmental remediation, reduced toxin exposure, and improved socio-economic outcomes.
Figure 4 - Global Cassava Production Systems.
A foundational agricultural resource supporting food security, economic resilience, and sustainable production systems.
In 2021, the global bitter cassava plant harvesting was estimated at 308 million tonnes (Blue Sense, 2023).
According to P. Torkaman et al., 2021, 30 - 40% of the plants total weight representing ~ 120 million tonnes of toxic agricultural cassava waste-water is recklessly discarded to the environment by flour manufacturers annually.
An estimated 800 million people in 80 countries including 500 million in Africa depend on the root as their main staple (Fran Robson et al., 2023).
Manipueira, which stinks when fermented, attracts insects, creates health threats, causes biodiversity destruction, contaminates the soil, drinking water, irrigation water contaminating the crops, and polluting the rivers.
