There is no standard lot size. However, some cities have similar lot sizes for houses. In Southern California, it's not uncommon for lots to be about 50' X 100', or about 5,000 square feet, in size. That's less than 1/8 acre, since an acre is something over 42,000 square feet. Some cities require that lots be of a certain size or higher before a second dwelling can be erected there, or restrict the square footage of the house on the lot to some proportion of the lot area.
General Types of Gold Ores: Gold deposits are often classified according to their association. The first of these may be catalogued as quartzose. This implies that the gangue mineral is acid, that is, quartz, and that fluorite may abound, or even the other gangue minerals of the alkaline earth group.
The only other common form of gold in ores is when the gold combines with tellurium and other metals. These minerals, like calaverite, are known as tellurides. On the other hand, silver ores are based mostly on sulfides that contain significant silver as a part of their metallic content.