$6 million of cocaine found at north Queensland boat ramp

The suspicious packages were found to contain cocaine. (Supplied: Queensland Police)

Packages of cocaine estimated to be worth $6 million have been found floating in the sea and near the remains of a burnt-out truck at an isolated north Queensland boat ramp.

Emergency services found the packages after they were called to a truck fire. (Supplied: Queensland Police)

In a statement police said 40 kilograms of cocaine was found at the Jimmys Rock boat ramp at Midge Point, 100 kilometres north of Mackay, about 8am on Saturday.

Rural fire fighters were called and arrived to find a flat-bed truck, which had a crane mounted on the back, well alight.

A torn package was found at a boat ramp on Jimmys Rock Road. (Supplied: Queensland Police)

Police were called to the boat ramp, which is only accessible by a dirt road, after the suspicious packages were found near the burning truck.

"Police conducted extensive patrols of the area including on land and in nearby water," the statement said.

"The public are urged to contact police should further packages be located and to not touch them."

Police are appealing for witnesses after 40 kilograms of cocaine was located at Midge Point on Saturday. (Supplied: Queensland Police)

Police are asking that anyone near the boat ramp between midnight and 12.15am on Saturday with relevant information, CCTV or dashcam footage come forward.