The -70/+140 cut (approximately 0.106 mm to 0.212 mm) is the finer mesh proppant used primarily in gas-window completions and in the early stages of a multi-stage frac to build near-fracture conductivity. In-Basin Sand produces a -70/+140 cut from Malargüe silica tested under API 19C / ISO 13503-2.
Dry-gas wells at depth frequently use -70/+140 as a primary or supporting proppant cut. Finer particles penetrate deeper into the fracture network and bridge less easily during stage placement. Pad-stage designs for oil wells also often include a small volume of -70/+140 to establish continuous conductivity.
| Property | API 19C threshold (sand) | In-Basin Sand |
|---|---|---|
| Sieve distribution | Min 90% within mesh | Per SGS report |
| Krumbein sphericity | ≥ 0.6 | Per SGS report |
| Krumbein roundness | ≥ 0.6 | Per SGS report |
| Acid solubility | ≤ 2% by weight | Per SGS report |
| Turbidity (FTU) | ≤ 250 | Per SGS report |
| Crush resistance | Fines ≤ thresholds at stress class | Validated per SGS attrition report |
Exact numeric values per SGS Minerals (Chile) report available under NDA via the data room.
All technical numbers on In-Basin Sand's -70/+140 cut trace to either the API 19C standard methodology, or the SGS Minerals (Chile) report performed on Malargüe material, or the Chevron 2023 proposal specs used during that engagement.
Both +30/+70 and -70/+140 ship from Malargüe under a single logistics envelope. Delivery to Añelo is ~30 km. Phase 1 capacity of 15,000 t/month can be split between the two cuts.
In-Basin Sand is running a €150,000 secured convertible bridge closing 29 April 2026. Public landing: https://inbasinsand.com