“Applied Botanical Chemistry for Safer, Sustainable Gold Recovery”
Mercury-Free Botanical Gold Recovery
Plant-derived lixiviant systems for mercury-free gold recovery, using botanical chemistry to replace toxic extraction methods with sustainable alternatives.
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.
Figure 1. Manipueira Gold Recovery Technology, Inc. Corporate Logo
In 2021, Manipueira Gold Recovery Technology, Inc. was founded in British Columbia to address one of mining's most persistent problems: the toxic use of mercury and synthetic cyanide in gold extraction.
The company developed and published 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 generated during processing of cyanogenic bitter cassava (Manihot esculenta). Disruption of cassava tissue initiates enzymatic degradation of naturally occurring cyanogenic glycosides, producing cyanide-containing species that can participate in the lixiviant chemistry.
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.
Figure 2. Manipueira Precious Metals Leaching Center Schematics.
In 2025, the company published a four-stage, ESG-aligned Action Plan with process schematics demonstrating the proposed conversion of a 50-tonne-per-day mercury-based amalgamation facility into a Manipueira Precious Metals Leaching Center.
This closed-loop framework reduces reliance on toxic reagents, minimizes waste streams, and creates parallel economic pathways for agricultural and mining communities.
As demand grows for cleaner and more responsible mineral-processing technologies, Manipueira presents a potential pathway for technology development, field implementation, and commercial evaluation while addressing environmental and occupational-health objectives.
Figure 3. Comparative analysis of gold recovery efficiency, toxicity profile, and environmental impact between plant-derived lixiviant systems (manipueira) and conventional mercury-based extraction methods.
Performance values based on published experimental findings; see Scientific Publications for source studies and methodology.
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 4. 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-derived ligand species participate in the solution chemistry governing gold mobilization and complex formation, providing an alternative to mercury amalgamation and conventional synthetic-cyanide processing.
Figure 5. Manipueira-based botanical extraction system demonstrating plant-derived lixiviant chemistry enabling mercury-free gold recovery with reduced environmental toxicity and circular resource integration.
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 6. Global Cassava Production Systems.
A foundational agricultural resource supporting food security, economic resilience, and sustainable production systems.
Global cassava production was estimated at approximately 308 million tonnes in 2021 (Blue Sense, 2023).
Torkaman et al. (2021) reported that cassava processing can generate substantial liquid and solid waste streams, representing approximately 30–40% of processed biomass under certain production conditions.
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).
When inadequately managed, fermenting manipueira can generate strong odors, attract insects, and contribute to environmental contamination through discharge into soils and surface waters. Improper disposal may consequently affect water quality, agricultural systems, and surrounding ecosystems.
“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).
