![]() To protect river fauna, the organisation “ UMR Borea” was engaged for the implementation of a protocol for monitoring the sea mammals and turtles during the blasting and dredging operations. ![]() Based on this survey a drilling pattern and a blast pattern were made. This was done with the aid of the RTK positioning system. ![]() In order to chart the exact shape of the bedrock, a survey was made after this layer had been removed. A water pump on board was removed to permit installation of Nitrex srl®’s drilling machinery. As the vessel’s spud poles were too short for the job, they had to be extended by 3 metres. This Italian-based company specialises in civil engineering projects involving the use of explosives. Baggerbedrijf De Boer’s water and air injection dredger “Delta Queen” was converted to suit the purposes of this operation. Consortium Baggerbedrijf De Boer/Nitrex srl®īaggerbedrijf De Boer contacted Nitrex srl® for blowing up the bedrock. This contract involved more than dredging, a partner with expertise in the field of explosives had to be sought. Because of this, they know the area very well. ![]() Grand Port Martime de Guyane therefore invited tenders for blowing up the rocks and removing the debris.īaggerbedrijf De Boer has been carrying out maintenance dredging on the Mahury river and in the harbour since 2008. Because the bedrock consisted of granite (diorite), there was only one solution: they had to use explosives! There was a risk of wave action and swell causing the ships to hit the rocks. ![]() These rocks impeded the passage of larger vessels to the quay extension and as a consequence only limited use could be made of the new quay. 200 metres above the desired depth level of -4.20 CM. During construction of the quay extension, however, they came across bedrock with a length of approx. Grand Port Maritime de Guyane improved an existing quay in the port of Dégrad des Cannes / Cayenne and extended it by 80 metres to allow vessels with increasingly deeper draughts access to the quay as well. ![]()
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