CHAPTER 6.
Configuration of the ground at Santo Domingo.—Excavation of valleys.—Geology of the district.—Decomposition of the rocks. —Gold-mining.—Auriferous quartz veins.—Mode of occurrence of the gold.—Lodes richer next the surface than at lower depths. —Excavation and reduction of the ore.—Extraction of the gold.— "Mantos".—Origin of mineral veins: their connection with intrusions of Plutonic rocks.