The Geology and Petroleum Department (GPD) is the custodian of all well, geophysical and geochemical data produced from petroleum exploration and development in Belize and are the property of the Government of Belize. The types of geophysical data are seismic, gravity and aeromagnetic data, while geochemical data are data on oil and gas seeps in soil and rocks and the chemical composition of liquid oil samples. All these data are either public or proprietary. All public data are data that were produced under exploration licenses that have expired or relinquished. Proprietary data are data that are produced by petroleum companies under current licences and only become public when the licence expires or is relinquished.