INTRODUCING THE LATEST IN MINE DEVELOPMENT TECHNOLOGYOctober 12, 2016
SANDVIK DD422i JUMBO TRIAL.
Aurelia Metals’ Hera mine to host training and familiarisation program for PYBAR’s new Sandvik DD422i jumbo drill.
In September, Hera will host a team comprised of Sandvik training specialists and a selection of PYBAR mining engineers, jumbo operators and drill fitters for training and trialling the advanced automated DD422i jumbo. Sandvik trainers will provide theoretical and practical training and assessment prior to, and during live drilling and blasting activities planned for the month of September.
The trials will allow insight into key productivity and safety features of the machine including rig alignment, operator assisted and automated drilling functionality, penetration rate comparisons, drill pattern and cycle time optimisation, as well as under/overbreak optimisation.
Approximately half the PYBAR trainees from the Hera trial will join the Oz Minerals’ Carrapateena team in South Australia where a similar machine, Sandvik DT920i, will be deployed (it runs the same operating system, but is fitted with even longer feeds). The remainder of the team will be engaged in Western Australia where the DD422i will be deployed.
FEATURES OF THE SANDVIK DD422i AND DT920i JUMBOS.
The DD422i and DT920i jumbos are fitted with long fixed-feeds:
• DT920i will be fitted with 8m feeds allowing 6.4m drill steels, 5.8m advance per round
• DD422i will be fitted with 7m feeds allowing 5.5m drill steels, 4.9m advance per round
The length of the feeds prevents rockbolting with these rigs so a separate dedicated bolting machine is required.
This is not just about drilling faster; it is about the quality of the outcome.
Not subjecting the machines to the trauma of rockbolting and scaling means they can be better equipped for rapidly and accurately advancing long rounds. Pins, bushes, hydraulic rams and feed rails are more likely to remain tight and straight.
A pre-determined drill pattern can be assigned including hole collar and toe positions, allowing the operator to apply the automated drill functionality or operator assist functions to drill precisely and repeatedly to that pattern.
Higher powered, high frequency drifters (RD525) are expected to provide an improved penetration rate (for most rock types) and reduce hole deviation.
Anticipated benefits of the DD422i
• Better life for tools and consumables
• Less overbreak
• Better productivity
• Consistent drilling results