Emergy-based environmental accounting of one mining system

Area of Science:

• Environmental Science
• Ecological Economics
• Industrial Ecology

Background:

• Metal production is vital for economic growth but often overlooks ecological sustainability.
• Current economic accounting tools do not fully capture the environmental costs of mining and metal production.
• A comprehensive evaluation framework is needed to assess the life cycle impacts of metal production.

Purpose of the Study:

• To propose an emergy-based evaluation framework for metal production, considering the entire life cycle.
• To quantify ecosystem service loss, CO2 emissions, and their impacts for a lead and zinc production system.
• To provide policy recommendations for promoting sustainable metal production.

Main Methods:

• Developed an emergy-based life cycle evaluation framework.
• Quantified ecosystem service loss and CO2 emissions associated with lead and zinc production.
• Analyzed the environmental performance of different subsystems (mining, beneficiation, smelting, refining).

Main Results:

• The economic value of minerals significantly undervalues the environmental work and costs of lead and zinc production.
• The metal production system heavily relies on nonrenewable resources, stressing local ecosystems.
• The beneficiation subsystem poses the highest negative environmental impact per emergy output, followed by smelting/refining and mining.

Conclusions:

• Metal production, particularly lead and zinc, incurs substantial environmental costs not reflected in economic valuations.
• Electricity consumption is a major contributor to CO2 emissions in the production process.
• Implementing lead recycling systems and sustainable policies is crucial for reducing environmental impact and promoting industry sustainability.