This page contains a drawing of what is possibly a winnowing shovel, aka "fan".

For ore or grain?
This oak shovel was found in the 19th century at or near an ancient copper mine in England.
So it is not certain whether it was used as a winnowing shovel or as an ore shovel,
or a winnowing shovel used as an ore shovel. The actual size of the tool is not stated.
If the overall length were to be approximately two meters, then the tool would seem to be more apt
for winnowing than for mining because the amount of ore in the scoop would have weighed more
than could be conveniently lifted repetitively by a man, while the amount of grain would have been
a convenient amount of weight to lift repetitively.

How old is it?
Radioactive carbon dating indicates that it was made in the Bronze age, between 1888 B.C. and 1677 B.C.

Additional information:
"Because he travels, Odysseus knows that what is an oar at the seaside is a winnowing shovel in the hills.
(...) these two senses do not exhaust the meanings of that fertile object. A winnowing shovel planted by its
handle in a heap of grain means that the harvest is done. An oar planted in a mound of earth marks a sailor's
grave."
Quoted from Trickster Makes this World by Lewis Hyde.
Source of quote: http://www.nqpaofu.com/2001/nqpaofu47.html

Definition and derivation of the word translated as "fan" are available here.

Image acknowledgement:
The image on this page was derived from an image at http://www.megalithic.co.uk/modules.php?op=modload&name=My_eGallery&file=index&do=showpic&pid=1643&orderby=dateD