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Lesson Overview
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Students investigate the collection of suspended particles in
water by a gelatinous precipitate as a model for the collection
of precious metals in molten rock samples by lead in the fire
assay method. Then students read about the technique of fire
assay as applied in the late 1800s and today and relate the model
lab activity to the reading. Students then analyze the fire assay
method to predict the steps in which error may be introduced.
Time Resources
The introduction may be 15 minutes. The lab activity takes
about one hour including the set-up and writing of observations.
Reading the fire assay article and making comparisons should take
about one half hour. Analyzing the fire assay method for
introduction of error may take about one half hour. The whole
lesson should take about 2.25 hours.
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Lesson Overview
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