alluvial diggings in a sentence

1. A school, a courthose and a prison were built, and the Free State Volksraad passed legislation to regulate the activities on alluvial diggings.
2. East of the main township area, on the western side and bed of a creek / gully, is a widespread and structureless area of alluvial diggings.
3. The significance of Cooktown as a port deteriorated in the 1890s, as production from the alluvial diggings on the James Murray, is understood to have paid off the debt on the convent building by conducting a lecture tour in the United States.
4. It's difficult to find alluvial diggings in a sentence.