Prince Charles and Camilla start a three-day of Cornwall and the Isles of Scilly today.
The Duke and Duchess of Cornwall will this morning formally open Heartlands in Pool near Redruth.
The 35 million pound community-led project, unveiled in April, has transformed a derelict tin mine in one of the poorest parts of the county.
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The major party leaders' campaigns for the General Election will remain suspended on Wednesday following the Manchester terror attack.
The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.
Prime Minister Theresa May announced the decision from Downing Street.