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AS3.3 Chemical Processes (Internal)

Welcome to Chemical Processes AS3.3 (91389)
DEMONSTRATE UNDERSTANDING OF CHEMICAL PROCESSES IN THE WORLD AROUND US
Credits: 3
Curriculum Level: 8
In this internal assessment you will focus your research and report on the extraction of gold using cyanide. This method is efficient and economically rewarding but carries with it a lot of controversy. Mainly surrounding cyanide waste products or tailings that can adversely effect humans, animals and the environment.

A full comprehensive report will include:
The student demonstrating a comprehensive understanding of the chemical processes involved in the world around us. This will be demonstrated in a written report that clearly covers the following points:
  • demonstrates consistent use of chemical equations and vocabulary to analyse the chemical processes involved in the extraction of gold using cyanide.
  • elaborates on the consequences of the chemical processes for the environment or people involved in the extraction.
For example, cyanide salts are readily soluble in  water so when they are inhaled they easily dissolve in the bird’s mucous membrane, leading to respiratory arrest and death.
  • compares and contrasts the processes used to reduce consequences of the cyanide extraction processes for the environment or people.
  • the student has consistently integrated chemistry vocabulary, symbols, conventions, and equations.

A general guide in regards to the report content is as follows:
  • Introduction - What is Gold? What is Cyanide? Importance of both. Uses world-wide etc.
  • Gold Extraction with cyanide. Full comprehensive explanation of process including all chemistry, reactions and equations.
  • Impacts of cyanidation gold extraction - pro's / con's, people impact, environmental impact.
  • Include good clear examples - e.g. effect on human body, fish in local area, bird life, plant life, longevity effects (how long do residues remain in the environment?). Are there case studies? Are there records of cyanide spills from gold mines? What happened? How was the accident handled?
  • Compare and contrasting of different methods used to reduce risk etc to people and the environment. What is done at different places (mines / countries etc).
  • Summary / Conclusion
  • References

The use of referenced diagrams etc is allowed to illustrate points etc.

TO AID YOU IN YOUR PREPARATION SOME RESOURCES AND VIDEOS  ARE PROVIDED BELOW.  PLEASE TAKE THE TIME TO WATCH EACH VIDEO AND TO VISIT THE RECOMMENDED WEBSITES!

RESOURCES
Gold Mining with cyanide.pdf
click to download
Gold Extraction and Recovery Processes.pdf
click to download
Overview Mining and NZC.pdf
click to download
Managing the use of cyanide.PDF
click to download
Cyanide_Leach_Packet.pdf
click to download
cyanide removal options in gold mining.pdf
click to download