In the Pacific region is extracted gold, silver and platinum.

Well, for example, it's used to extract gold from ore.

This mill was probably used to extract gold and silver.

The government has actively encouraged foreign involvement in extracting and processing gold.

However, this method cannot be used to extract gold which is present in sulphides.

In that city many companies were formed for the purpose of extracting gold.

Some of them had tried to use bacteria to extract gold from dirt.

New techniques were used to extract gold from otherwise uneconomic ore.

Also, at what point does it become economical to extract gold from seawater?

This reaction is widely used for extracting gold from electronic and other "rich" materials.