Bedrock exposure is rare in the Hope Creek area, except on ridgetops, and locally along creeks. Micaceous quartzite, typically weathering to massive slabs and blocks, is the most abundant rubble and forms most of the bedrock outcrops. White, sulfide-free, quartz lenses, segregations and veinlets are common in the quartzite. Quartz-mica schist and pelitic schist also form some outcrops. Nonfoliated hornblende quartz monzonite occurs as small bodies in Hope Creek drainage. The rock varies in composition between quartz monzonite and monzogranite. Hornblende quartz monzonite is commonly altered to chlorite-ankerite-sericite with or without pyrite. Fluorite and garnet are occasionally present. Alteration occurs both along plutonic contacts and along shear zones within the plutons. Numerous cobbles and boulders of sulfide-bearing hornfels occur in Hope Creek. Samples of sulfide-bearing hornfels and quartz-monzonite north of Hope Creek are strongly anomalous in As (up to 7,000 ppm) and Au (up to 550 ppb) and moderately anomalous in Sb (up to 120 ppb). Sulfide-bearing hornfels and quartz monzonite samples from south of Hope Creek are also anomalous in these elements with maximum values of 53 ppm As, 43 ppb Au, and 29 ppb Sb. Virtually no mineralization was observed in metamorphic rocks away from plutonic contacts. In summary, sulfide-bearing hornfels and altered quartz monzonite samples near hornblende quartz monzonite contacts are the most gold-rich rocks found in the Hope Creek drainage. (Swainbank and Burton, 1987, p. 6-19 to 6-22)