Actlabs Sample Preparation pricing is all-inclusive including: sorting, drying, labeling, new reject bags, using cleaner sand between each sample and crushing samples up to 7 kg (for RX1 and RX1-SD)

As a routine practice for rock and core, the entire sample is crushed to a nominal -2 mm, mechanically split to obtain a representative sub-sample and then pulverized to at least 95% -105 microns (µm). All of our steel mills are mild steel and do not introduce Cr or Ni contamination. Quality of crushing and pulverization is routinely checked as part of our quality assurance program.

Code RX1Crush (< 7 kg) up to 80% passing 2 mm, riffle split(250 g) and pulverize (mild steel) to 95% passing 105 µm included cleaner sand
Code RX1-ORECrush up to 90% passing 2 mm
Code RX1+500500 grams pulverized
Code RX1+800800 grams pulverized
Code RX1+10001000 grams pulverized
Code RX1-SDCrush (< 7 kg) up to 80% passing 2 mm, rotary split(250 g) and pulverized (mild steel) to 95% passing 105µm
Code RX1-SD-ORECrush up to 90% passing 2 mm
Code RX3Oversize charge per kilogram for crushing
Code RX4Pulverization only (mild steel)(coarse pulp or crushed rock) (< 800 g)
Code RX5Pulverize ceramic (100 g)
Code RX6Hand pulverize small samples(agate mortar & pestle) (<5g)
Code RX7Crush and split (< 5 kg )
Code RX8Sample prep only surcharge, no analyses
Code RX9Compositing (per composite) dry weight
Code RX10Weight (kg) as received
Code RX11Checking quality of pulps or rejects prepared by other labs and issuing report
Code RX12Ball Mill preparation
Code RX13Rod Mill preparation
Code RX14Core cutting
Code RX15Special Preparation/Hour
Code RX16Specific Gravity on Core
Code RX16-WSpecific Gravity (WAX) on friable samples
Code RX17Specific Gravity on the pulp
Code RX17-GPSpecific Gravity on the pulp by gas pycnometer

Further Reading:

This method consists of determining the mass of a specimen in air and subsequently immersing it in water. The apparent mass of a sample upon immersion in water is determined and its specific gravity calculated. This test method is based on ASTM D792 Standard Test Method for Density and Specific Gravity (Relative Density).

Sample size is 20-50 gram and any loose pieces should be removed before weighing and immersing. If material is lost during weighing the test is restarted. Two pieces per sample are measured to show variance and to identify samples to be rechecked. Samples are to be rechecked if the variance between the Specific Gravities for the 2 samples is greater or equal to 0.075. Temperature of water and sample must be at 23 °C +/- 2 °C.

The Calculation of specific gravity is as follows:

Sp gr 23/23 °C = a/(a+w-b)


a = apparent mass of specimen, without wire or sinker in air

b = apparent mass of specimen (and of sinker, if used) completely immersed in water.

w = apparent mass of totally immersed sinker if used and wire.

Specific gravity is measured using the relative volumes of solids to water and air in a given volume. This can be used on solids that pass the 4.75 mm (No. 4) sieve. The measurement is done using a Pycnometer (calibrated volumetric flask) following ASTM D854.

This test cannot be used for soil solids which can be altered by this method, contaminated with a substance that prohibits the use of this method, or for highly organic soil solids, such as fibrous matter, which floats in water.

Precision and bias are determined to judge the acceptability of the test results. QC is 12 % for each batch of 50, 1 blank, 1 Silica flour control, 4 sample duplicates.