What is the location of the Rock and Metal Mills laboratory, and where should I ship my samples for testing?
Our lab is located at 106 Watchung Ave, Plainfield, NJ, 07060, USA. You are requested to submit your sample material at the above-mentioned address.
What defines a properly prepared sample?
A well-prepared sample is essential for obtaining accurate analytical results. It must be homogeneous and truly representative of the entire batch. This means the material should be correctly processed at a suitable facility, with proper sampling techniques applied. Typically, we require 30–100 grams of material ground to 70 mesh, after which our laboratory handles the analysis.
Why choose Rock and Metal Mills for analyzing investment materials? What sets your lab apart?
There are three key reasons:
- ISO 17025 Accredited & ISO 9001:2015 Certified:
These certifications guarantee accuracy, precision, and strict adherence to quality control protocols, ensuring dependable results. - Independent Laboratory:
As a family-owned business, our sole focus is delivering unbiased, scientifically accurate results without external influence. - Customer-Centric Approach:
We value long-term relationships with clients worldwide and prioritize clear communication, dedication, and trust.
What metallurgical testing services are offered?
Rock and Metal Mills provides a wide range of services, including precious metals analysis (fire assay, ICP, gravimetric/wet chemistry), catalyst testing (spent and fresh), copper concentrate analysis, and electronic scrap (e-scrap) evaluation. Core methodologies include fire assay, wet chemistry, and advanced instrumental analysis, along with on-site representation services.
Do you offer on-site representation or third-party witnessing?
Yes. We provide independent on-site services such as inspection, weighing, and sampling at processing facilities, ensuring transparency and reducing risk throughout the process.
Why is on-site representation important?
Handling large volumes of material carries risks such as loss, inconsistent quality, or theft. Having an on-site representative minimizes these risks, ensures accurate procedures, and keeps you informed at every stage. It acts as a safeguard for your investment.
What are LOD and LOI? Are they the same?
No, they are different techniques:
- Loss on Drying (LOD): Measures moisture content by comparing weight before and after drying. It may also remove volatile substances.
- Loss on Ignition (LOI): Determines organic or combustible content by measuring weight loss after high-temperature heating.
Each method provides distinct information about the sample.
Is the lab accredited and what does it cover?
Yes. The laboratory is ISO/IEC 17025:2017 accredited (ANAB) and ISO 9001:2015 certified. The scope includes PGM analysis, LOI/LOD, fire assay for gold and silver, and copper concentrate testing, all maintained under current accreditation standards.
Why are ISO certifications important?
These certifications ensure consistent, reliable, and internationally recognized results. They validate the lab’s expertise, strict procedures, and use of traceable standards for accurate analysis.
Can I access your ISO documentation?
Yes, both ISO 17025 and ISO 9001:2015 documents are available for viewing and download.
What types of materials are accepted?
We accept ores, concentrates, alloys, precious-metal-bearing scrap, catalysts, and e-waste solutions. For unusual materials, please contact us.
Do you handle hazardous or radioactive materials?
No, these materials are not accepted.
Do you provide international on-site services?
Yes, on-site witnessing and representation services are available globally.
What is the minimum sample size for testing?
A minimum of 2 grams is required for high-value materials.
What is the typical detection limit?
Detection limits vary by material, but are generally around 10 ppm.
Are there any sample preparation requirements?
Yes. Raw materials are not accepted. Samples must be fully processed and ground to 70 mesh before submission.
For e-scrap: CPUs are not accepted, and all plastic components must be removed.
Where is Rock and Metal Mills located?
106 Watchung Ave, Plainfield, NJ, 07060, USA
Phone: +1 (732) 310-6437
Do you have other locations?
No, we currently operate from a single location.
Where should samples be shipped?
Send all materials to:
Lab Office
Rock and Metal Mills
106 Watchung Ave, Plainfield, NJ, 07060, USA
Phone: +1 (732) 310-6437
What is the turnaround time?
Results are typically delivered within 5–12 business days, depending on the material.
Are there job opportunities available?
You may submit your resume to info@rockandmetalmills.com. Suitable candidates will be contacted.
Which shipping carrier should be used?
Any reliable carrier is acceptable. We recommend using one that offers tracking and delivery confirmation.
Where can materials be processed before submission?
Processing can be carried out at IPMI-approved facilities.
What are the requirements for incoming samples?
All submitted samples must meet the following criteria:
- Approximately 50 grams per sample
- Ground to 200 mesh
- Completely dry (no wet or damp material accepted)