UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

January 25, 2017

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:  ☒ Form 20-F    ☐ Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ☐

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:  ☐ Yes    ☒ No

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): n/a

NEWS RELEASE

BHP BILLITON OPERATIONAL REVIEW

FOR THE HALF YEAR ENDED 31 DECEMBER 2016

BHP Billiton Chief Executive Officer, Andrew Mackenzie, said: “We have performed well during a period of higher prices, with record iron ore volumes achieved at WAIO. Our simpler organisational structure has freed our assets to focus on what matters most and to deliver safer and more productive operations. Our consistent delivery of operating and capital productivity, and strict adherence to our capital allocation framework have positioned us to maximise shareholder value.

“In Petroleum, we will accelerate our counter-cyclical oil exploration efforts this year. Our successful Trion bid leaves us in a leading position to develop the newly opened Mexican acreage in the Gulf of Mexico, where we can leverage our core expertise. We are encouraged by recent positive drilling results at the LeClerc well in Trinidad and Tobago and the Caicos well in the Gulf of Mexico. After the first successful rig, our Onshore US gas hedging program will also be expanded to secure attractive returns.”

Summary

Operational performance

Production for the December 2016 half year and quarter and guidance for the 2017 financial year are summarised in the table below.

Major development projects

During the December 2016 quarter, the Bass Strait Longford Gas Conditioning Plant project achieved initial gas sales, under budget, and production is ramping up to full rate. In December 2016, mechanical completion was achieved at the Escondida Water Supply project with first water expected to be delivered in the March 2017 quarter, on schedule and budget. These two projects will not be reported in future Operational Reviews.

BHP Billiton has two major projects under development in Petroleum and Potash, with a combined budget of US$2.9 billion over the life of the projects. Both projects remain on time and on budget.

Corporate update

BHP Billiton expects Underlying attributable profit(1) in the December 2016 half year to include gains related to asset divestments in a range of approximately US$150 million to US$200 million (Underlying EBITDA(1) impact of US$175 million to US$225 million).

In addition, the Group expects to record an exceptional item of US$164 million (US$115 million post-tax) related to the cancellation of the Caroona exploration licence and subsequent reimbursement received during the December 2016 half year.

On 20 December 2016, Samarco, Vale and BHP Billiton Brasil agreed a non-binding term sheet outlining the general terms and conditions for the use of Vale’s Timbopeba pit by Samarco to deposit its tailings, should Samarco restart. A definitive agreement remains subject to a successful commercial negotiation, due diligence and relevant government approvals. These processes are likely to occur during the 2017 calendar year.

On 18 January 2017, Samarco, Vale and BHP Billiton Brasil have also entered into a preliminary agreement with the Federal Prosecutors’ Office in Brazil in relation to the Fundão tailings dam failure on 5 November 2015(3) (Preliminary Agreement). The Preliminary Agreement outlines the process and timeline for negotiation of a settlement of the BRL 155 billion (approximately US$47.5 billion) Civil Claim relating to the dam failure.

For the December 2016 half year, we are not yet in a position to provide an update to the ongoing potential financial impacts on BHP Billiton Brasil of the Samarco dam failure. Any financial impacts will continue to be classified as an exceptional item.

The above guidance will be updated should material information or events arise as the Group finalises its financial statements.

Marketing update

The average realised prices achieved for our major commodities are summarised in the table below. The majority of iron ore shipments were linked to the index price for the month of shipment, with price differentials predominantly reflecting product quality and market fundamentals. The majority of metallurgical coal and energy coal exports were linked to the index price for the month of shipment or sold on the spot market at fixed or index-linked prices, with price differentials reflecting product quality.

At 31 December 2016, the Group had 267 kt of outstanding copper sales that were revalued at a weighted average price of US$2.51 per pound. The final price of these sales will be determined over the remainder of the 2017 financial year. In addition, 316 kt of copper sales from the 2016 financial year were subject to a finalisation adjustment in the current period. The provisional pricing and finalisation adjustments will increase earnings before interest and tax by US$37 million in the December 2016 half year.

Petroleum

Production

Total petroleum production – Total petroleum production for the December 2016 half year decreased by 15 per cent to 105.9 MMboe. Guidance for the 2017 financial year remains unchanged at between 200 and 210 MMboe, comprising Conventional volumes between 123 and 127 MMboe and Onshore US volumes between 77 and 83 MMboe.

Crude oil, condensate and natural gas liquids – Crude oil, condensate and natural gas liquids production for the December 2016 half year decreased by 20 per cent to 48.2 MMboe.

Onshore US liquids volumes decreased by 37 per cent to 16.4 MMboe as a result of a reduction in activity in the Black Hawk for value and natural field decline, which more than offset increased liquids production from the Permian.

Conventional liquids volumes decreased by seven per cent as higher production at Bass Strait and North West Shelf and an additional infill well at Mad Dog partially offset natural field decline across the portfolio and planned maintenance at Atlantis.

Natural gas – Natural gas production for the December 2016 half year declined by 10 per cent to 347 bcf.

The decline primarily reflects lower Onshore US gas volumes as a result of the decision to defer development activity for value and the divestment of our gas business in Pakistan. This was partially offset by higher demand at Bass Strait and Macedon and increased LNG volumes at North West Shelf.

On 5 September 2016, BHP Billiton announced the sale of 50 per cent of its interest in the undeveloped Scarborough area gas fields. ExxonMobil will remain operator of Scarborough and operatorship of North Scarborough will transfer from BHP Billiton to Woodside. The sale was completed during the December 2016 quarter.

Projects

Petroleum capital expenditure guidance of approximately US$1.4 billion (excluding US$0.2 billion from capital creditor movements) for the 2017 financial year remains unchanged. This includes Conventional capital expenditure of US$0.8 billion which is focused on life extension projects at Bass Strait and North West Shelf. Onshore US capital expenditure is expected to be US$0.6 billion with development activity tailored to market conditions.

During the December 2016 quarter, BP (the operator) sanctioned the Mad Dog Phase 2 project. Approval from BHP Billiton´s Board will be sought during the March 2017 quarter.

Onshore US development activity

Onshore US drilling and development expenditure for the December 2016 half year was approximately US$273 million. Our operated rig count increased from two to three during the December 2016 quarter with deployment of a rig in the Haynesville in October 2016, following the successful execution of our hedging pilot. Additional hedge activity during the quarter has led to approval of a second rig in the Haynesville with operations expected to commence in March 2017. Completions activity in the Black Hawk was accelerated in the December 2016 quarter to drawdown drilled and uncompleted inventory as market conditions improved. We are currently progressing trials in the Black Hawk, testing the potential for staggered wells to increase recovery, larger frac jobs to improve productivity and the potential of the Upper Eagle Ford horizon. We expect early results of these trials to be known during the September 2017 quarter.

Petroleum exploration

Exploration and appraisal wells drilled during the December 2016 quarter are summarised below.

The Burrokeet-1 well encountered mechanical difficulty shortly after spud and was plugged and abandoned. Non-commercial hydrocarbons were encountered at Burrokeet-2 with analysis ongoing. Phase 1 of the Trinidad and Tobago deep water drilling campaign has concluded. Following the oil discovery in the Shenzi North and Caicos wells in the central Gulf of Mexico, the Invictus rig has been mobilised for drilling the Wildling well in the March 2017 quarter.

During the December 2016 quarter, BHP Billiton won the bid to acquire a 60 per cent participating interest in and operatorship of blocks AE-0092 and AE-0093, containing the Trion discovered resource, in Mexico. Subject to satisfaction of conditions, BHP Billiton anticipates signing the relevant agreements in the March 2017 quarter.

In the US Gulf of Mexico, we increased acreage position and operatorship in the Southern Green Canyon Miocene and Western Gulf of Mexico Paleogene key focus areas. The regulator awarded all 12 of the leases for which BHP Billiton was the apparent high bidder in the Western Gulf of Mexico Lease Sale 248. In addition, BHP Billiton cross-assigned nine leases in Green Canyon with Statoil Gulf of Mexico LLC and Repsol E&P USA Inc. The cross-assignment results in BHP Billiton having a 65 per cent interest and operatorship over the nine leases, ahead of drilling the Scimitar exploration well in the June 2017 quarter. The regulator also approved assignment of BHP Billiton’s 60 per cent interest in two leases in Green Canyon (GC 633 and 676) to Chevron U.S.A. Inc.

In Australia, seismic work commenced in the Exmouth sub-basin following regulatory approval of the Good Standing Agreement in relation to the WA-475-P permit. The WA-335-P permit was officially relinquished after receiving consent from the regulator to surrender the permit.

Petroleum exploration expenditure for the December 2016 half year was US$364 million, of which US$217 million was expensed. An US$820 million exploration program is now planned for the 2017 financial year, an increase of US$120 million from prior guidance, following the successful bid for Trion in Mexico and positive drilling results at the LeClerc well in Trinidad and Tobago and the Caicos well in the Gulf of Mexico.

Copper

Production

Copper – Total copper production for the December 2016 half year decreased by seven per cent to 712 kt. Production for the 2017 financial year is now expected to be approximately 1.62 Mt, two per cent below prior guidance, and reflects a reduction in volumes at Olympic Dam.

Escondida copper production for the December 2016 half year was unchanged at 452 kt as higher concentrate production was offset by lower cathode production. During the period there was a four day site-wide suspension of operations to conduct an investigation following a fatality on 21 October 2016. Production guidance for Escondida remains unchanged at 1,070 kt, with volumes weighted to the second half of the 2017 financial year. The current Collective Agreement with Escondida N°1 Union expires on 31 January 2017 and negotiations for a new agreement are in progress. The commissioning of the Escondida Water Supply project and the planned ramp-up of the Los Colorados Extension project late in the 2017 financial year, will enable full utilisation of three concentrators during the 2018 financial year.

Pampa Norte copper production for the December 2016 half year decreased by eight per cent to 116 kt, with an unplanned outage offsetting improved recoveries at Cerro Colorado, and planned maintenance offsetting record ore milled at Spence in the December 2016 quarter. Copper production decreased by 13 per cent from the September 2016 quarter mainly due to suspension of the processing operations at the Cerro Colorado Ore Handling Plant 2 following the failure of a transfer chute. Pampa Norte copper production guidance for the 2017 financial year remains unchanged and is expected to be higher than the prior year supported by the completion of the Spence Recovery Optimisation project which achieved an annualised production run rate of 200 ktpa in the month of December 2016.

Olympic Dam copper production for the December 2016 half year decreased by 30 per cent to 78 kt following planned maintenance and a state-wide power outage which commenced on 28 September 2016. Power was safely restored on 14 October 2016 and operations were fully ramped-up in the December 2016 quarter. Olympic Dam copper production of approximately 160 kt to 170 kt is now expected for the 2017 financial year. Lower volumes reflect the power outage and unplanned maintenance at the refinery which commenced at the end of December 2016, ahead of the major smelter maintenance campaign planned for the September 2017 quarter.

Antamina copper production for the December 2016 half year decreased by nine per cent to 66 kt reflecting lower copper grades as mining progressed through a zinc rich ore zone, consistent with the mine plan. Guidance for the 2017 financial year remains unchanged at 130 kt. Zinc production for the December 2016 half year increased by two per cent to 38 kt with guidance for the 2017 financial year unchanged at 90 kt.

Project

Iron ore – Total iron ore production for the December 2016 half year increased by four per cent to 118 Mt or 136 Mt on a 100 per cent basis. Guidance for the 2017 financial year remains unchanged at between 228 and 237 Mt or between 265 and 275 Mt on a 100 per cent basis, excluding production from Samarco.

WAIO achieved record production for the December 2016 half year as a result of the continued ramp-up of additional capacity at Jimblebar with the commissioning of a new primary crusher and additional conveying capacity. Combined with improved track reliability and lower scheduled maintenance at Yandi, volumes increased by four per cent from the September 2016 quarter. The rail renewal and maintenance program, which will support the supply chain’s long-term reliability, is progressing ahead of schedule and is now expected to be completed in the June 2017 quarter.

Mining and processing operations at Samarco remain suspended following the failure of the Fundão tailings dam and Santarém water dam on 5 November 2015.

Metallurgical coal – Metallurgical coal production for the December 2016 half year increased by one per cent to 21 Mt. Guidance for the 2017 financial year remains unchanged at 44 Mt.

Strong performances at Broadmeadow, Peak Downs, Saraji and Caval Ridge, underpinned by additional stripping and higher wash-plant utilisation, more than offset the completion of longwall mining at Crinum in the December 2015 quarter, adverse weather conditions in the September 2016 quarter and lower yield at South Walker Creek.

Record production at Peak Downs was achieved during the December 2016 quarter with coal opportunistically trucked to Caval Ridge in order to utilise latent wash-plant capacity.

Energy coal – Energy coal production for the December 2016 half year decreased by four per cent to 14 Mt. Guidance for the 2017 financial year remains unchanged at 30 Mt.

New South Wales Energy Coal recorded improved underlying truck utilisation, however production declined by 13 per cent as a higher drawdown of in-pit and Run-of-Mine (ROM) inventories benefitted the December 2015 half year. This was partially offset by an 11 per cent increase in volumes at Cerrejón compared to the December 2015 half year which was constrained by drought conditions.

The divestment of Navajo Coal was completed on 29 July 2016, with management of the mine transferred to Navajo Transitional Energy Company on 31 December 2016.

Nickel – Nickel West production for the December 2016 half year increased by 10 per cent to 40.9 kt. Ongoing debottlenecking activities have resulted in record production at the Kwinana refinery. Nickel production guidance for the 2017 financial year remains unchanged and is expected to increase by approximately 10 per cent from the prior year.

Potash project

Minerals exploration

Minerals exploration expenditure for the December 2016 half year was US$75 million, of which US$75 million was expensed. Greenfield minerals exploration is predominantly focused on advancing copper targets within Chile, Peru, Canada, South Australia and the South-West United States.

Variance analysis relates to the relative performance of BHP Billiton and/or its operations during December 2016 half year compared with the December 2015 half year, unless otherwise noted. Production volumes, sales volumes and capital and exploration expenditure from subsidiaries are reported on a 100 per cent basis; production and sales volumes from equity accounted investments and other operations are reported on a proportionate consolidation basis.

The following footnotes apply to this Operational Review:

The following abbreviations may have been used throughout this report: barrels (bbl); billion cubic feet (bcf); cost and freight (CFR); cost, insurance and freight (CIF); dry metric tonne unit (dmtu); free on board (FOB); grams per tonne (g/t); kilograms per tonne (kg/t); kilometre (km); metre (m); million barrels of oil equivalent (MMboe); million cubic feet per day (MMcf/d); million tonnes (Mt); million tonnes per annum (Mtpa); ounces (oz); pounds (lb); thousand barrels of oil equivalent (Mboe); thousand ounces (koz); thousand standard cubic feet (Mscf); thousand tonnes (kt); thousand tonnes per annum (ktpa); thousand tonnes per day (ktpd); tonnes (t); and wet metric tonnes (wmt).

Further information on BHP Billiton can be found at: bhpbilliton.com

Members of the BHP Billiton Group which is

headquartered in Australia

Follow us on social media

Production summary

Production summary

Throughout this report figures in italics indicate that this figure has been adjusted since it was previously reported.

Production and sales report