1955of Pacific Coast Geographers49 GOLD MINING IN THE NICARAGUA RAIN FOREST* J. J. Parsons Univ. of California, Berkeley In no country of the New World does gold and gold mining play so prominent a role in the national economy as it does in the Central American Republic of Nicaragua. If the USSR's production is excluded, Nicaragua's annual bullion output of 260,000 ounces in recent years has accounted for better than one per cent of the world's gold production. Among the Latin American* republics only Mexico and Colombia surpass it,- on a per capita basis Nicaragua (1950 population, 1,057,000) stands easily at the head of the list. With the world's gold-mining industry in the doldrums gold was nevertheless the leading export from Nicaragua every year but one between 1938 and 1949. Recently , in the face of soaring coffee prices, it has dropped to second place on the country's export list. In 1953 reported bullion shipments were valued at $8.7 million (U. S.) or nearly $8 per capita. Colonial Nicaragua had no mines of importance. In the latter part of the 19th century several vein mines were brought into production in the drier and more populous western half of the country. The manager of one of these was the Englishman Thomas Belt, author of A Naturalist in Nicaragua, one of the real classics of natural history and geography. At least three of these vein mines still operate today, an easy few hours drive from Managua. Two of them (El Limon, La India) are owned by a Canadian company (Noranda Mines, Ltd.), while Belt's old Javali mine in Chontales is in the hands of local Nicaraguan capital. Together they account for about one-third of Nicaragua's gold production. *The writer visited Nicaragua in the spring of 1953 in connection with field studies supported by the Office of Naval Research. He also acknowledges the hospitality and assistance of his friend Stuart McCullough, manager of the Neptune Gold Mining Company of Bonanza. 50 Yearbook of The Association Vol. 17 Gracia» a Dios 1 , 9i milesPuerto Cabe PIS PIS DISTRL ~w -^ cutía IAIUZMINES/^ r y Cutcuma Alamicambra tes» 0 40«0 MILES nxapolka Bluefteldj Fig. 1. Mining districts and main transportation routes of northeastern Nicaragua. 19SSof Pacific Coast Geographers51 The larger share of Nicaragua's gold comes from mines located in the rain-drenched hills 180 miles east of Managua and 90 miles from the Atlantic coast at the headwaters of tributaries of the Rió Coco and the Rió Prinzapolca (Figure 1). These mines were discovered in 1889-90 by castilla rubber collectors moving up the navigable rivers from the Miskito Coast. In Latin America the good mines are almost always antiguas, but there is no indication that the existence of gold here had been known either to the Indians or to the early Spaniards. The reason is not difficult to see. The rain forest of eastern Nicaragua is one of the least accessible and least known areas of tropical America. Its only roads are the rivers, which are fed by an annual rainfall which ranges from 100 to 150 inches. Along the Caribbean coast and extending northward into Honduras there is an extensive quartz gravel plain which is covered with pine savanna, perhaps the rainiest area of such size anywhere on earth which is a grassland. The boundary between savanna and forest (the "bush lines") lies roughly half way between the coast and the mines. The Pis Pis District and La Luz There are no placers of consequence in eastern Nicaragua. The gold most commonly occurs in veins that were intruded into the Tertiary andésite lavas which cover much of the central interior of the country. The Pis Pis District is characterized by a complex pattern of roughly parallel auriferous quartz ledges and stringers which stand up a ridges against the softer, deeply weathered country rock. The geologic pattern has been likened to that of California's Mother Lode region. At La Luz the ore is disseminated through an extensive limestone mass, a part of a larger limestone island which was left uncovered by the lavas. Two major companies today account...