1) Barite is a naturally occurring mineral used primarily as a weighting agent for drilling fluids in oil and gas exploration. It accounts for over 80% of barite production globally.
2) World barite production and consumption is directly linked to oil and gas drilling activity. Major producers are China, India, the US, Morocco and Turkey, accounting for over 80% of global supply. The US is the largest consumer.
3) While estimates of global barite reserves exist, there is limited reliable data. Production has increased from 5 million tonnes per year in the 1990s to around 8.5 million currently. If trends continue, production could reach 9.5-10 million tonnes by 2020.
Barite that is used as an aggregate in “heavy” cement or radiation shielding cement is crushed and screened to sizes ranging from 4 mesh (Tyler) (4.75 millimeters) to 1 .5 inches (3.75 millimeters) for the coarse grade. New Riverside Ochre Co., I nc. in Georgia is the primary supplier of barite aggregate. (USGS Minerals Yearbook—2004)
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Barite that is used as an aggregate in “heavy” cement or radiation shielding cement is crushed and screened to sizes ranging from 4 mesh (Tyler) (4.75 millimeters) to 1 .5 inches (3.75 millimeters) for the coarse grade. New Riverside Ochre Co., I nc. in Georgia is the primary supplier of barite aggregate. (USGS Minerals Yearbook—2004)
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1. Drilling grade barite: the global outlook
By Andrew Scogings
Published: Wednesday, 31 December 2014
As unconventional shale oil and gas exploration and development continues at pace in North America and
further afield, Andrew Scogings, Industrial Minerals Consultant, provides an executive summary of IM’s
upcoming research report on drilling-grade barite.
Barite (barytes) is naturally-occurring barium sulphate (BaSO4) and is the predominant barium mineral used for
industrial purposes. The mineral occurs in veins, stratiform beds and lenses in addition to residual deposits. The
largest deposits currently mined are stratiform beds in China, India and the US. Barite is utilised primarily for its
high specific gravity (SG 4.5) in addition to its chemical and physical inertness, relative softness and very low
solubility.
Mineral weighting alternatives to barite include celestite, calcium carbonate, ilmenite and synthetic hematite.
Apart from calcium carbonate, none of these mineral substitutes has had a major impact on the barite drilling
mud industry. Cesium formate brines (SG 2.2) have been developed for challenging high pressure, high
temperature (HPHT) drilling operations and are produced from pollucite at the TANCO lithium mine in
Manitoba, Canada.
Table 1: American Petroleum Institute barite specifications
API 13A - Barite physical and chemical requirements
Requirement Standard
Density (Clause 7) 4.20 g/ml, minimum
Density (Clause 20) 4.10 g/ml, minimum
Water-soluble alkaline earth metals, as calcium 250 mg/kg, maximum
Residue greater than 75 m Maximum mass fraction 3.0%
Particles less than 6 m in equivalent spherical diameter Maximum mass fraction 30%
Source: API Specification 13A, August 2014
Table 2: Drilling grade barite prices, December 2014
Low $ High $
Barite, Drilling grade, ground SG 4.22, bagged, FOB Morocco, $/tonne 110 170
Barite, Drilling grade unground lump, OCMA/API, Bulk, SG 4.20, FOB Chennai,
$/tonne
138 145
Barite, Drilling grade, API unground lump, SG 4.20, FOB China, $/tonne 112 128
Barite, Drilling grade unground lump, OCMA/API bulk, SG 4.10 FOB Chennai,
$/tonne
110 125
Barite, Drilling grade, API unground lump, SG 4.10, FOB China, $/tonne 109 113
Barite, unground lump, OCMA/API bulk, SG 4.20, FOB Morocco, $/tonne 115 127
Barite, API, lump, CIF Gulf Coast, Chinese, $/tonne 145 160
Source: IM
Reserves, production and consumption
No reliable information is available with regard to the total world reserves of barite, however the US Geological
Survey (USGS) estimates 350m tonnes of reserves of which China, India and Kazakhstan are claimed to account
for 219m tonnes (63%). This global reserve base should be sufficient for more than 40 years’ life at current
production rate and prices.
Significant deposits of barite have been identified (but not quantified) in northern Alaska, although these have
not yet been brought to account, probably due to remote location. In terms of public reporting according to
2. international codes such as JORC and NI 43-101, it is cautioned that the reserves reported by USGS are unlikely
to meet current criteria as either resources or reserves especially in terms of geological continuity and economic
viability.
Mining and processing
The geometry and type of barite deposit affects mining economics and processing complexity. Briefly, vein
deposits have complex geometry and may often be extracted from surface or underground as a co-product of
lead or zinc mining. Residual deposits are shallow enough to be mined opencast using dozers, excavators or
front end loaders. Bedded barite deposits are more extensive and have more consistent grades; these can be
exploited by large-scale open pit methods, followed by relatively simple processing.
Barite is extracted by both surface and underground mining, generally followed by simple physical processing
methods to produce correctly sized product and to
remove extraneous (mainly silicate gangue) materials. Flotation may be used to separate barite from finely
intergrown gangue minerals.
3. Reserves, production and consumption
World barite production is directly linked to oil and gas-well drilling activity (Figure 1) and has increased from
around 5m tpa in the 1990s to around 8.5m tonnes in 2013. Globally, more than 80% of barite produced is used
as a weighting agent for drilling fluids in oil and gas exploration.
When considering barite reserves suitable for use in drilling fluids, there are relatively few major sources with
China, India, the US and Morocco, Mexico and Turkey accounting for about 80% of global production. China
accounts for around 45% of world production with India, US, Morocco and Turkey making up a further 35%
(Figure 2).
The US is the largest barite consumer at around 3m tpa, accounting for more than 30% of annual shipments. It is
followed by China, which consumes around 1.1m tpa barite. The global barite markets are skewed; for example
70% of European domestic production is for added-value manufacturing sectors such as chemical and filler
industries.
In contrast, the US uses over 95% of its barite output for the oil drilling industry, highlighting a general
correlation between rig activity and barite consumption, though this ratio has been affected over the past decade
due to increased horizontal drilling, which in the US currently accounts for 70% of compared with only 15% in
2004 (Figure 3). It appears that increased drilling of horizontal holes per rig platform has resulted in higher
consumption of barite per rig.
There are relatively few large global manufacturers of drilling fluids, including MI SWACO, Halliburton, Baker
Hughes and Newpark, which dominate the field through a network of global subsidiaries.
In terms of drilling location, the Gulf of Mexico (GoM) is the largest consumer of drilling-grade barite in the
world, and for a number of years this was dominated by imports of Chinese lump barite to grinding mills in
various coastal locations. Indian barite supply has risen and is now believed to account for nearly one quarter of
imports to the GoM.
Industry specifications
The American Petroleum Institute (API) introduced a new barite grade (SG 4.1) in August 2010, in addition to
the long-standing 4.2 specification. The intention was not to replace the 4.2 grade, but to provide the end-user
with choice as to which material to use. This change was driven in part by a shortage of SG 4.2 barite, especially
4. from mines in Nevada, which is the US’s primary domestic barite producing region. Drilling-grade barite is
specified by the API and must meet certain SG, chemical and sizing requirements (Table 1).
Although not an API specification, drilling companies have started to focus on heavy metal content in particular
mercury (Hg <1ppm) and cadmium (Cd <3ppm) as specified by the US Environmental Protection Agency
(EPA) for the GoM. Additional heavy metals may also be taken into account for example silver (Ag), arsenic
(As), chromium (Cr), copper (Cu), lead (Pb), selenium (Se) and zinc (Zn), although there are no set limits for
oilfield applications.
Barite prices
Barite prices are linked to purity and in the case of drilling-grade barite, the SG as illustrated by current FOB
Chinese prices where a premium of approximately 15% applies to SG 4.2 compared with SG 4.1. There is also a
variation in price according to source, as illustrated by current Indian lump FOB being about 10% higher than
China.
Barite prices remained relatively steady until approximately 2006 relative to 1995 dollars, after which they
increased rapidly until around 2012 and have currently fallen back slightly in 2014, but still some 200% above
the inflated 1995 dollar base. This sharp increase resulted from a number of factors including rationalisation and
consolidation of the Chinese barite mines, in addition to highly intensified US onshore drilling for tight oil and
gas which placed further pressure on suppliers.
Logistics
Crude (lumpy) barite is shipped globally by sea, mainly from China and India to milling plants strategically
located close to oil and gas drilling hotspots such as the Gulf States, the North Sea and the US GoM. Key
export cities are Zhenjiang and Fangcheng in China; Krishnapatnam, Chennai and Puducherry in India,
Buchanan in Liberia and Ensenada and Guayamas in Mexico. Major import destinations are New Orleans,
Galveston, Corpus Christi and Brownsville in the southern US, Ijmuiden in Holland and Dammam in Saudi
Arabia.
Milled API-grade barite is shipped to numerous destinations both from barite producing countries such India,
China, Morocco, US, Turkey, Kazakhstan, Mexico and Vietnam, in addition to barite millers in Holland and the
US.
5. Barite producers may either ship directly to their customers, or ship via intermediaries or agents who specialise
in barite sourcing, shipping and logistics and sales partnerships.
Outlook and forecasts
Liquids remain the world’s largest energy source throughout the IEO 2010 Reference case projection, given
their importance in the transportation and industrial end-use sectors. World use of liquids and other petroleum in
the IEO2010 Reference case grows from 86.1m barrels per day (bpd) in 2007 to 92.1m bpd in 2020, 103.9m bpd
in 2030, and 110.6m bpd in 2035.
This growth in petroleum usage suggests that petroleum exploration will continue to grow and, along with it,
barite consumption, especially as more drilling has to be done per unit of oil as hydrocarbon discoveries become
smaller and less productive with time. However, the recent sharp drop in crude oil prices may result in
decreased exploration in the short term, similar to the trend seen in 2009 immediately after the Global Financial
Crisis.
Projecting global barite production based on 1998 (6m tonnes) to 2013 (8.2m tonnes) indicates that 9.5 to 10m
tpa may not be an unrealistic market by 2020, tempered somewhat by the recent drop in oil prices.
This feature serves as an executive summary of IM’s Drilling Grade Barite report, available to purchase from
January 2015. To order your copy or to receive a report brochure please contact Emma Hughes, Special
Projects Editor, on ehughes@indmin.com or +44 (0) 207 827 6449.