The following economic minerals are located in Trinidad and Tobago:
- Andesite – Tobago. This rock type is part of the Bacolet Formation, which includes according to Maxwell (1948) “interbedded tuffs, tuff breccias and agglomerates and some intercalated flows”. The two largest quarries in Tobago are sited in andesitic rocks of the Bacolet Formation. These are: Green Hill Quarry and Studley Park.
- Argillite – A siliceous siltstone which outcrops in Southern Trinidad.
- Chromium – Tobago.
- Clay – Trinidad and Tobago. In Trinidad, clay is the most abundant and extensively utilized non-petroleum raw material. Localities include Longdenville, Wallerfield (near Arima), Valencia-Quare River area, Mayo, Carlsen Field, Guatapajaro Road 4 miles south of Cumuto, Arima-Blanchisseuse Road, San Rafael, Central Trinidad, Plaisance Industrial Estate – Pointe-a-Pierre, Winfield Scotts Quarry, Tobago at Rocky Bay, Old Government Stock Farm and Bishops High School.
- Copper – Tobago
- Fluorspar – Gaspar Grande Island
- Graphite – St Joseph
- Gypsum – Agostini Street and Champs Fleurs
- Iron – Maracas Valley
- Limestone – Northern Range
- Porcellanite and uncalcined clays and sands
- Sand and Gravel (Natural aggregate)
- Quartz gravel
- Sandstone
The minerals that are quarried are primarily sedimentary in origin. Blue coloured limestone and sharp sand and gravel of various grades are quarried in the Northern Range for use in the construction industry. Plastering sand, or red sand, is quarried in central Trinidad and used as a low grade fill material and as a construction finishing material. Yellow- coloured limestone is quarried in the south central portion of Trinidad. Clay is extracted from the central and south eastern areas of Trinidad and primarily used in the manufacture of blocks, tiles and pottery.
Oil sand and asphalt are quarried in south western Trinidad. They are used as road paving material. Argillite is found in south Trinidad. Porcellanite is also extracted from the extreme southern areas of Trinidad and used as an alternative to Portland cement and as low grade road base material.