Cardno says the acquisitions of two US-based companies with an emphasis on the defence sector and greenhouse gas abatement will contribute an extra $US48 million ($A46.96 million) of earnings for the group.
Together, the acquisitions will add 330 staff to Cardno's existing operations in the Americas.
The international infrastructure and environment services group said on Tuesday that it would pay up to $US31 million ($A30.33 million) for the purchase of Marshall Miller & Associates (MM&A).
Cardno managing director Andrew Buckley said the MM&A acquisition would provide Cardno with new expertise in resources, mining engineering, carbon credits and energy consulting across a number of key international markets.
MM&A is a 180-person mining, energy and environmental consulting firm headquartered in Bluefield, Virginia.
"With the addition of MM&A, Cardno can now offer clients specialist services in greenhouse gas inventorying, carbon sequestration and carbon off-set credit verification," Mr Buckley said in a statement.
MM&A's energy-related clients include the US Department of Energy to mining companies including ArcelorMittal and BHP Billiton.
Cardno will pay a further $US14.25 million ($A13.94 million) for the purchase of EM-assist, a 150-person environmental services and compliance management firm, headquartered near Sacramento, California.
EM-Assist's client base includes the US Air Force, US Marine Corps and the US Army Corps of Engineers.
The purchase complements that of Cardno TEC, which was acquired by Cardno in October last year.
Mr Buckley said the acquisition of EM-Assist would further expand the group's expertise in environmental management in both the defence and private sector markets.
"The addition of EM-Assist further strengthens Cardno's capabilities to support defence agencies in the US, Australia and globally," he said.
MM&A's acquisition is expected to contribute around $US33 million in revenue, while EM-Assist is expected to contribute revenue of around $US15 million.
Both acquisitions will be majority funded by cash, with 12 per cent to come from shares.
Cardno last week said it expected to report a net profit of between $A71 million and $A74 million for the year ending June 2012, an increase of between 21 and 26 per cent on the previous financial year.
Cardno was up eight cents at $7.77 at 1513 AEST.
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