Dear Dr.Yadu,
Mercury sources were not totally unknown in ancient India. Skaanda
PuraNa (Prabhasakshetra mahatmya Ch.135.v 35-37) mentions a lake
containing Rasa as formed due to falling of extra terrestrial objects
near Prabhasa. RasaarNavakalpa (INSA publication) mentions Kardama
Mountains as a source. This has been investigated by a geologist and
is located to be near Siddhapura (N 24 E 72.5). Details are available
in my published paper at
http://www.scribd.com/doc/5991466/Profile-of-a-natural-disaster-in-sanskrit-literature-by-R-N-I
About Mercury being the semen of Shiva, (I do not find any difficulty)
I take such statements to be metaphors alluding to an already existing
tradition of cosmogony. The episode of falling of Linga from the sky
is in the PuraNas and indirectly in the Vedas also. Shiva is called
IriNya in the Yajurveda (Rudra Sukta) and we know IriNa is the Rann-of-
kutch very near the old Prabhaasa (not the modern Somanatha) of the
Skaanda PuraNa where the lake of Rasa existed.
The story of Mohini Avatara of VishNu and the dropping of (Rudra)
Shiva’s semen appears in many places. Even RaamaayaNa alludes to this
and links this to the occurrence of Gold and other metals on earth.
See Bala kanda Ch 36.16-19 and the next Chapter. (Shiva’s semen
falling on earth & Birth of Skanda)
" 'Oh, Fire-god, you please coordinate the mission of gods, oh, great-
resplendent god of Fire, you may release the potence of Shiva, which
you have contained so far, in the daughter of King of Mountains,
namely River Ganga.' Thus, all gods have requested the Fire-god.
[1-37-11]
yat asyaa nirgatam tasmaat tapta jaa.mbuunada prabham || 1-37-18
kaa.ncanam dharaNiim praaptam hiraNyam atula prabham |
taamram kaarSNaayasam caiva taikSNyaat eva abhijaayata || 1-37-19
malam tasya abhavat tatra trapu siisakam eva ca |
tat etat dharaNiim praapya naanaa dhaatuH avardhata || 1-37-20
My inference is there already existed in the memory of our ancients
that such an episode had happened in the still remote past. Eventually
this means valuable elements (gold, silver, Mercury perhaps
diamond,..) were thought to be coming from above. Not a bad theory at
all. We know now that heavy metals occur at meteoritic craters.
Already Vedic people knew that meteorites (Maruts) bring precious
material to earth (sanaaddhi vo ratnadheyaani santi | RV X.88.8). This
could be a later view of the falling "maruts" after physical
examination of the objects and a feel for their contents.
RN Iyengar