Ms Giddings said she expected Venture Minerals' proposal for a $200 million tin mine at Mount Lindsay to be approved, creating 1000 jobs.

She listed that development, Venture's Riley Creek mine and the recently approved Shree Metals mine at Nelson Bay as signs that mining investment would grow in Tasmania now that the ``dark cloud'' of the Tarkine national heritage nomination had been removed.

Ms Giddings made the comment yesterday while visiting Rocherlea's Welding Works, which she said would benefit from an expanded mining industry.

``We have seen a little slowing of the mining industry in recent times and with that dark cloud that was hanging over the Tarkine there was a level of pessimism coming into the mining investment sector here in Tasmania,'' Ms Giddings said.

``But with that dark cloud now removed, we are seeing positive moves to mining investment in this state.''

Braddon Liberal MHA Adam Brooks said the proposed forest peace deal would block mining in a number of mineral-rich areas.

Mr Brooks said a proposed extension to the South West World Heritage Wilderness Area and forest reserves in the North-East and North-West would wipe out other potential mining sites.

``Some of Tasmania's most mineralised land will be locked up forever under the disastrous forestry deal,'' Mr Brooks said.

Resource  Minister Bryan Green said existing mine sites were excluded from the nomination to extend the world heritage area.