When a sector is setup to allow redevelopment with respect to the tile resource, a primitive factory will NOT be 'upgraded' or replaced (since the primitive buildings don't provide an upgrade but rather have to replace) by the 'space' tech version.
Since the sector is setup to allow redevelopment I would assume it would know to replace that primitive factory with a mine or something else mineral related, but they never do.
Since the sector is setup to allow redevelopment I would assume it would know to replace that primitive factory with a mine or something else mineral related, but they never do.