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Simulating cable yarding costs and production rates : a case study of first thinning operations within pinus radiata plantations on steep slopes in South Eastern Australia

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  • Cable yarding of first thinning size material from plantations of Pinus radiata in South Eastern Australia 15 simuiated using a computer model. Production rates, expressed in cubic metres per hour and production cost, expressed in dollars per cubic metre were derived using the model to simulate cable yarding under set conditions. Values for the production rate and cost were obtained from the simujation of three machines; a Koller K-300, a Timbermaster and a Hadjil 071, all rigged as standing skylines on uphill settings and using intermediate supports. Results obtained by the simulation runs are presented showing the variation of total average costs per cubic metre, with slope distance of the setting and the variation of production per hour against slope distance. For each machine an optimal landing spacing and slope distance was identified for operations in forests of given average thinning piece size. Management implications and alternative harvesting strategies are discussed concerning the introduction and use of such machines to cable log this forest type.
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