COST OF DREDGING. 373 



towed by tugs, including all charges except interest and 

 depreciation, was 2*77 pence per ton of material dredged. 



Ayr. 1 The average cost of working a hopper-dredger in 

 four-fifths clay and boulders and one-fifth silt and sand, and 

 conveying to sea a distance of three miles, is given as 0'94 

 pence per ton, exclusive of interest, depreciation, and insurance. 

 This rate is divided in the following proportion : 



Pence. Per cent. 



Wages ... 0-703 = 74'79 



Stores, etc. 0'090 = 9'56 



Coals and coaling 0'147 = 15'63 



0-940 



(In this rate, the cost of repairs and maintenance appears to have been 

 omitted.) 



Swansea. Dredging in the entrance channel of the Prince 

 of Wales's Dock, through mud, clay, and gravel, and removing" 

 a distance of seven miles to sea by hopper-barges, cost, including 

 charges except interest and depreciation, 3'525 pence per ton 

 of dredged material. 



This rate is divisible in the following proportions : 



Pence. Per cent 



DBEDGING Wages 0-969 = 27'49 



Towage 0-979 = 27-77 



Hoppers 0-293 = 8'31 



Fuel 0-293 = 831 



Maintenance and stores 0991 = 2814 



3-525 100-02' 



Dredging under the same conditions, but with hired bucket- 

 ladder dredger and hopper-barges, including all charges for 

 plant, cost 10 '45 pence per ton of material lifted. 3 



Belfast Lough. 4 Dredging carried on by hopper-dredgers 

 of 800 tons capacity, in cutting the new deep-sea channel 

 3J miles long in the exposed estuary, and conveying the 

 dredged material an average distance of nine miles, cost 217 

 pence per ton, including all charges except interest and deprecia- 

 tion on the cost of the plant. 



Tyne. 5 The average cost of dredging on the Tyne, and 

 conveying to sea to distances varying from four to seventeen 

 miles, based on the result of one year's working (1886), was 



1 M.P.LC.K, vol. Ixxxix. p. 85. 2 Ibid., p. 71 ; vol. ciiL p. 358. 



1 Ibid., voL ciii. p. 357. * Ibid., voL Ixxxix. p. 104. 



Ibid., pp. 100, 101. 



