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surface.count_entities_filtered{area=…, position=…, name=…, type=…, force=…, limit=…}

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surface.count_entities_filtered{area=area, force=player_force, limit=1}

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function find_first_good_tile_in_chunk(chunk, surface, good_tiles_list)
	for y = (chunk.y*32), (chunk.y*32+31) do
		for x = (chunk.x*32), (chunk.x*32+31) do
			local tile = surface.get_tile(x, y)
			for i, tile_name in pairs (good_tiles_list) do
				if tile and (tile.name == tile_name) then
					return true
				end
			end
		end
	end
	return false
end