original: The yellow disc represents the island's history in phosphate mining.
simplifications: Original: The yellow disc marks the island's phosphate mining. The yellow disc reflects the island's history in mining. The yellow disc is a symbol for the island's history in phosphate mining. The yellow disc stands for the island's phosphate mining. The yellow circle represents phosphate mining. The yellow disc is a representation of the history of phosphate mining on the island. The yellow disc denotes the island's history in phosphate mining. The island's history in phosphate mining is shown through the yellow disc. The yellow disk reflects the history of phosphate mining on the island. The yellow disc stands for the island's history in phosphate mining.