Deposit of iron, copper, and lead are likewise found and mined in the area. Despite a tendency among Philippine island inhabitants towards insular individualism, the people of Marinduque did not evolve their own dialect. Tagalog, the mother tongue of its neighboring provinces to the north is spoken by 99 percent of its inhabitants. Only 45 percent can speak Englinsh and 3 percent can speak Spanish. Marinduque is agricultural, having no well-organized manufacturing or processing of the island products.
Agriculture is practiced by antiquated methods.
The limited arable land area and the prevalence of hills and mountains in the province limit extensive production of this staple crop. Coconut is the major crop of the province and is its top revenue earner. This is a place bestowed with vast fishing grounds. It has also a substantial mineral deposits such as gold, silver, and copper. A marker stands at the site of the bloodiest battle ever fought on the island between the Marinduque Revolutionary Forces and the Americans.