OREAS and Geostats reference materials
Certified reference materials (CRMs) for assay quality control: gold, copper, lithium and blank material. We keep 42 codes in stock in Astana. Anything not in stock can be delivered to order: OREAS within 2 weeks, Geostats within 10 days. These materials are also called geological standards or QA/QC standards. You can buy geological standards from a single pack, with the manufacturer's certificate and delivery across Kazakhstan.
Geological standards for QA/QC
| Code | Manufacturer | Au, ppm | Cu, % | Packaging | Availability |
|---|---|---|---|---|---|
| OREAS 922b | OREAS | 0.02 | 0.219 | pouch | to order, 2 weeks |
| OREAS 507b | OREAS | 0.175 | 0.618 | pouch | 6.98 kg |
| OREAS 263b | OREAS | 0.211 | 0.0075 | pouch | 3.42 kg |
| OREAS 600c | OREAS | 0.221 | 0.058 | — | 1.02 kg |
| OREAS 501e | OREAS | 0.230 | 0.274 | jar | 5 kg |
| OREAS 153a | OREAS | 0.311 | 0.712 | jar | to order, 2 weeks |
| OREAS 250c | OREAS | 0.313 | 0.0024 | — | 25 kg |
| OREAS 153c | OREAS | 0.327 | 0.712 | jar | 1.5 kg |
| OREAS 230 | OREAS | 0.337 | 0.0172 | — | 10 kg |
| OREAS 630b | OREAS | 0.358 | 0.0518 | pouch | to order, 2 weeks |
| OREAS 284 | OREAS | 0.404 | 0.0028 | — | 25 kg |
| G921-4 | Geostats | 0.44 | — | — | 3 kg |
| G916-4 | Geostats | 0.51 | — | — | 3.5 kg |
| G321-5 | Geostats | 0.51 | — | — | 6.5 kg |
| G924-1 | Geostats | 0.54 | — | — | 1 kg |
| OREAS 285 | OREAS | 0.656 | 0.0031 | — | 25 kg |
| OREAS 503d | OREAS | 0.666 | 0.524 | pouch | to order, 2 weeks |
| OREAS 503e | OREAS | 0.709 | 0.531 | jar | 8 kg |
| OREAS 601d | OREAS | 0.817 | 0.107 | pouch | to order, 2 weeks |
| OREAS 525 | OREAS | 0.818 | 1.35 | pouch | 1.26 kg |
| OREAS 252c | OREAS | 0.827 | 0.0027 | — | 25 kg |
| OREAS 628 | OREAS | 0.868 | 1.74 | — | to order, 2 weeks |
| OREAS 232b | OREAS | 0.946 | 0.0026 | pouch | 28.12 kg |
| OREAS 601c | OREAS | 0.996 | 0.116 | pouch | to order, 2 weeks |
| OREAS 233b | OREAS | 1.075 | 0.0161 | — | 25 kg |
| OREAS 701 | OREAS | 1.11 | 0.491 | — | to order, 2 weeks |
| OREAS 624 | OREAS | 1.16 | 3.1 | pouch | 2.58 kg |
| OREAS 234 | OREAS | 1.2 | 0.0175 | — | 45 kg |
| OREAS 626 | OREAS | 1.26 | 0.36 | pouch | 7.8 kg |
| G911-10 | Geostats | 1.3 | — | jar | to order, 10 days |
| G911-3 | Geostats | 1.37 | — | jar | 10.5 kg |
| OREAS 286 | OREAS | 1.4 | 0.0038 | pouch | 28.96 kg |
| OREAS 504d | OREAS | 1.46 | 1.10 | — | to order, 2 weeks |
| OREAS 504c | OREAS | 1.48 | 1.11 | pouch | to order, 2 weeks |
| G916-2 | Geostats | 1.98 | — | pouch | 25 kg |
| OREAS 237b | OREAS | 2.26 | 0.0028 | — | 25 kg |
| OREAS 238b | OREAS | 3.08 | 0.0031 | — | to order, 2 weeks |
| G900-7 | Geostats | 3.22 | — | pouch | 47 kg |
| G922-2 | Geostats | 3.25 | — | — | 8 kg |
| OREAS 287 | OREAS | 3.79 | 0.007 | — | 25 kg |
| G316-10 | Geostats | 4.65 | — | pouch | to order, 10 days |
| G922-5 | Geostats | 5 | — | jar | 19 kg |
| G312-4 | Geostats | 5.3 | — | jar | 13 kg |
| G318-4 | Geostats | 5.93 | — | pouch | 8.5 kg |
| OREAS 258 | OREAS | 11.15 | 0.0101 | — | to order, 2 weeks |
| OREAS 243 | OREAS | 12.39 | 0.0173 | — | to order, 2 weeks |
| OREAS 992b | OREAS | 15.00 | 45.98 | — | to order, 2 weeks |
| G317-3 | Geostats | 16.81 | — | jar | 2 kg |
| G918-8 | Geostats | 33.57 | — | jar | 2 kg |
| G319-10 | Geostats | 50.3 | — | jar | 2 kg |
| OREAS 49 | OREAS | 61.3 | 0.0167 | — | 3 kg |
| OREAS 23b | OREAS | — | — | pouch | 20 kg |
| OREAS 921b | OREAS | — | 254 ppm | jar | 0.5 kg |
| OREAS 21h | OREAS | — | — | — | 30 kg |
| OREAS 313 | OREAS | — | 0.036 | — | to order, 2 weeks |
| OREAS 922 | OREAS | — | 0.212 | — | to order, 2 weeks |
| OREAS 906 | OREAS | — | 0.31 | pouch | 17 kg |
| OREAS 317 | OREAS | — | 0.413 | — | to order, 2 weeks |
| OREAS 923 | OREAS | — | 0.423 | — | to order, 2 weeks |
| OREAS 926 | OREAS | — | 0.813 | pouch | to order, 2 weeks |
| OREAS 929 | OREAS | — | 2.00 | — | to order, 2 weeks |
| OREAS 932 | OREAS | — | 6.13 | — | 10 kg |
Each pack comes with the manufacturer's certificate of analysis showing certified values and tolerances.
FAQ
How many standards should be inserted per batch?
Typically one CRM per 20–30 samples, plus a blank and a duplicate. Your project's QA/QC protocol sets the exact scheme.
What is the difference between GSO and CRM?
A GSO is entered in a national register of reference materials. A CRM is issued by a producer such as OREAS or Geostats with a certificate and tolerances from inter-laboratory testing. See the guide on GSO, OSO, SOP and CRM.
How do I choose standards for my deposit?
Use two or three materials: near cut-off grade, near average grade and high grade. The matrix should resemble your ore. Send us your grades and we will suggest codes.
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