ENV 100 Chap.9 Mineral Resources and Sustainable Supply
Mineral Resources and Sustainable Supply
This chapter connects critical minerals with the geological processes that concentrate them in magmatic, pegmatitic, vein, sedimentary, and weathering settings. It follows extraction through waste, reclamation, remining, circular use, and recycling, then distinguishes carbon dioxide removal from geological storage in reservoirs beneath effective seals.
What this chapter covers
- 01
Critical-mineral demand
- 02
Geological deposit settings
- 03
Mining waste and tailings
- 04
Reclamation and remining
- 05
Circular material flows
- 06
Carbon removal and storage
Worked example · free
Evaluate remining of old tailings
- +1Compare concentration and processing demand.
- +1Credit avoided new excavation where relevant.
- +1Include contaminant and water controls.
- +1Track the new residue to final containment.
Key terms
- Critical mineral
- A critical mineral is economically important and vulnerable to supply disruption.
- Pegmatite
- A pegmatite is an exceptionally coarse igneous body that can concentrate unusual elements.
- Tailings
- Tailings are residues left after valuable material is separated from ore during processing.
- Circular economy
- A circular economy keeps products and materials in use while reducing waste and new extraction.
- Reservoir seal
- A reservoir seal is a low-permeability layer that limits upward fluid migration.
Mineral Resources and Sustainable Supply FAQ
Why are mineral deposits geographically uneven?
Concentration requires particular magmatic, hydrothermal, sedimentary, metamorphic, or weathering processes. Most crust contains useful elements at levels too low or dispersed for economically practical extraction.
Can recycling replace all new mining?
Recovery reduces primary demand, but collection losses, processing losses, quality limits, long product lives, and growing demand prevent a closed loop. Demand management and governed supply remain necessary.
What makes geological carbon storage plausible?
A site needs reservoir pore space and permeability, a secure seal, suitable pressure conditions, a manageable injection pathway, and monitoring capable of detecting movement or leakage.
When can remining reduce impacts?
Old waste may contain recoverable material and has already been excavated, creating an opportunity to recover value while treating a legacy liability. The outcome improves only when recovery, energy, water, contaminant control, and containment of the new residue perform better across the full boundary.
How does a reservoir seal work?
A porous and permeable reservoir provides storage volume and fluid pathways, while an overlying low-permeability seal limits upward migration. Storage security depends on their geometry, pressure behaviour, faults or wells, trapping processes, and monitoring rather than on rock type alone.
Assessment move
Study each mineral as a chain rather than a commodity name. Begin with geological setting, identify the process that concentrated the element, state the form in which it occurs, and then follow extraction, processing, use, recovery, and residue. Build comparison cards for magmatic, pegmatitic, hydrothermal, sedimentary, and weathering-related deposits.
Each card should include the evidence that distinguishes the setting, not just a list of products. For criticality questions, separate geological abundance from economic importance and supply vulnerability. A material can be present in the crust yet remain difficult to extract at useful concentration.
Draw the circular-material figure from memory and mark every point where material can be lost, diluted, downcycled, stored in long-lived products, or returned to use. This prevents recyclable from being treated as equivalent to recovered.
Evaluate mining and remining with a shared boundary that includes concentration, excavation already completed, comminution, energy, water, contaminants, recovery, new residue, reclamation, and monitoring. Write conditional conclusions that specify when one option improves the outcome. For carbon questions, separate atmospheric removal from geological storage.
Sketch capture, transport, injection, reservoir movement, trapping, seal performance, and monitoring as distinct stages. Label the reservoir properties of pore space and permeability, then label the seal property that limits upward migration. Compare basalt and sandstone only through the processes and storage roles covered in the course.
Add structural, residual, soluble, and mineral trapping to a time sequence without claiming that all operate equally at once. Retrieval practice should alternate a deposit diagnosis, a life-cycle comparison, and a storage-screen problem. In every exercise, identify the missing measurement that could reverse the conclusion.
Before the test, practise a seven-sentence resource evaluation: geological suitability, concentration, extraction burden, waste or water issue, recovery route, displaced impact, and monitoring condition.
Your final check asks whether the same service and time horizon were used for each option, whether circularity reduced rather than merely relocated demand, and whether the conclusion follows from measured geology instead of a technology label.
