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  • Grasberg Final Wall Slope Optimization

Grasberg Final Wall Slope Optimization

  • 17 Jan 2024
  • 6:00 PM - 9:00 PM
  • Hexagon's Tucson office (and virtual)


  • Registration is for Hexagon employees only. Registration code required.
  • If interested, please contact SME Tucson, as this is on a first-come-first-served basis.
  • For UA SME Student Chapter members only. Please make sure you are in good standing with the UA SME Student Chapter.
  • Virtual attendee. Register to give us a head count and to receive a meeting reminder the day of the event.


Join us for our next SME Tucson Hybrid Meeting! For those that want to join us in person, please go ahead and make your reservation. Hexagon has graciously allowed us to host this event at their office and is our venue/food/drink sponsor.

Make sure to select your meal when making your reservation. Reservation deadline is Friday, January 12th, at noon.  If you choose to join virtually, you will receive a link prior to the event.


This presentation presents final wall Slope Optimization practices at Grasberg Mine which resulted in a 14% and 17% increase to bench face angle (BFA) and inter-ramp slope angle (ISA), respectively, and subsequent increase in metal recovery totaling over 40% additional copper, and 42% additional gold. 

Located in remote jungle province of West Papua Indonesia, at an elevation of 4,200 meters, sits the Grasberg open pit mine. Grasberg mine implemented high quality Slope Optimization program for final pushback, with the goal to safely increase recoverable metals through steeper slopes, while utilizing existing infrastructure and equipment. Most emphasized programs are blast QA/QC improvement, as built slope measurement (slope audit program), and short-range planning modification.

Grasberg was originally divided into two primary areas for slope steepening, with ISA of 51° and 52°, all areas in pit with 70° BFA. Through continuous developments, collaboration and achievement, Grasberg final pit was modified for BFA increase to 80° for all areas, and an ISA increase to 56°, and 60°, in respective areas.

Meeting sponsor:


Venue and beverage sponsor:

Speaker: Allen Kinney, Freeport-McMoRan

Allen Kinney received a B.S. in Civil Engineering from Washington State University, and went on to receive an M.S. in Mineral Engineering, specializing in Explosive Engineering from New Mexico Tech.  He began his career with Freeport in 2010 at Chino mine in New Mexico.  Allen moved to P.T. Freeport Indonesia in 2013 where he worked for nearly ten years in various roles, primarily in support of both surface and underground drilling and blasting programs.  Allen is currently the Mine Operations Superintendent at Freeport’s Sierrita Mine. 

  • 6:00pm - 7:00pm Social Hour
  • 7:00pm - 7:45pm   Dinner
  • 7:45pm - 8:00pm Announcements (START OF VIRTUAL MEETING)
  • 8:00pm - 8:30pm Program
  • 8:30pm - 8:45pm Q&A

Location: HEXAGON, 40 E Congress St #300, Tucson, AZ 85701. CLICK FOR MAP.


  • $45 for SME Tucson members
  • $55 for non-members
  • Free for UA SME Student Chapter members
  • Free for virtual attendees

Payable at the door by cash, credit card, or check payable to SME Tucson.

Cancellations and No Shows:

Please call or email by the registration deadline to cancel.  If you do not cancel your reservation by the deadline, SME is still required to pay for your dinner and you will in turn be billed. Thank you. 

Virtual Meeting Information will be sent to registrants.

Thank you to all our 2023 Scholarship Fundraiser Sponsors:

Mother Lode Hexagon Mining, AMES Construction, ASARCO
Bonanza Freeport-McMoRan Sierrita OperationsStantec, Epiroc
Big Nugget WSPGranite, M3 Engineering
Pay Dirt AusencoFlorence Copper, Call & NicholasMcCraren Compliance, GroundProbe, Independent Geomechanics, Patrick Gorman,
Montgomery & AssociatesPiteau AssociatesRuen Drillling, Tetra Tech
Prospect Darling Geomatics
Supporters SRK ConsultingCori HoagMayes Consulting

SME Tucson Section
PO Box 65931
Tucson, Arizona 85728
(520) 314-5066
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