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Querns for grinding cereals were essential in the everyday life of the Pre-European population of the Island of Gran Canaria as their agriculture was based mainly on barley and wheat, cereals processed for the most part in the form of roasted flour. Rotary querns and other grinding stones, nonetheless, have rarely been the object of research in the Canary Islands and the study of their operational sequence of production has only recently been initiated. Volcanic tuff (compact lapilli) was the most commonly quarried rock. Other raw materials such as basalt, and to a lesser extension tephrite, were also worked. Since metal tools were not known in the Canary Islands in Pre-European contexts, all of the stages of extraction and fashioning had to be carried out with stone tools.This paper analyses the operational sequence, that is, the different phases of the extraction and fashioning techniques of basalt rotary querns based on the recent finds of two quarries located near the coast (Cardones and Cebolla) and a quern manufacturing workshop (Cave 36, Arucas Municipality) in a ravine about 600 m inland. Traditionally it was thought that the Pre-European population of Gran Canaria fashioned their querns from naturally detached volcanic surface blocks collected in ravines or along the coast. This supposition was based on the idea that the early Canarians were not capable of extracting blocks from bedrock with stone tools. This notion, however, has been proven wrong by the circular extraction negatives on the quarry faces and by finds of stone fashioning tools in the workshop

The quarry and workshop of Barranco Cardones (Gran Canaria, Canary Islands): Basalt quern production using stone tools