The Eastern Quarry site which stretches from Bluewater to Ebbsfleet Station in North Kent is owned by Land Securities.

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Until now, the search for her has been concentrated on a disused quarry site at Alltami, where her burnt-out car was discovered nearby.

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The site, which is part of an old slate quarry, has been used as a refuse site for 30 years, and receives 60, 000 tonnes of rubbish a year.

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Mr McKenna added that it was also working closely with Natural England to preserve the archaeological heritage of the quarry, which is a Site of Special Scientific Interest.

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The Earth Trust manages the site, a former gravel quarry, on behalf of electricity company Npower.

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It follows a major rock fall at the quarry in April 2012 that saw half a million tonnes of rock cover the quarry floor and hamper operations at the site.

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The Penrhyn site remains the largest single slate quarry in the world, supplying 85% of all Welsh slate.

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The loan to quarry owners Welsh Slate helped speed up the acquisition of the site, after planning approval was granted in December.

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Viridor said it was disappointed by the decision as the quarry has been earmarked by the county council as a suitable waste site.

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The quarry is owned and run by Cemex, which extracts sand and gravel from the site.

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The 220 acre site boasts a ruined castle, a small cottage, a lighthouse and a granite quarry.

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