3. Bulk and waste materials are also characteristics of processing industries.
The bulk and waste materials key (Figure 1-3) will assist you in the identification
of bulk materials and waste by comparing the bulk or waste to the tone of the
photo. Using this key you should be able to limit the type of industry you have by
comparing the tone of the material on your photo to the chart.
For example: A
black or dark grey tone indicates either coke or slag which could belong to either
coke and iron production, aluminum reduction, or ore smelting.
Bulk Materials and Waste Identification Key.