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Sierra offers physical placer and crystalline gold mine reserves from verified deposits across California's historic Mother Lode counties.

Published Weight Ranges & Odds: Every mine reserve displays its minimum and maximum gross weight, purity baselines, and complete 10,000-basis-point (100%) mathematical odds before you purchase. There are no hidden tiers or surprise fees.

Authoritative Allocation: When your checkout completes, our depository server assigns a specific, real physical gold specimen to your account. You can then trigger the interactive discovery reveal in the mobile app to inspect your specimen's exact gross weight, fine gold content, origin, and assay serial number.

When you allocate a piece, it remains under your legal depository bailment in climate-controlled, institutional vault facilities in California.

Zero Ongoing Fees: Unlike traditional precious metals storage depositories that bill monthly maintenance and holding fees, Sierra provides complimentary vault custody for as long as you choose to keep your gold in the vault.

Sonic Tamper-Sealed Slabs: Each specimen is encased in an airtight, sonically welded security slab with anti-counterfeiting holographic elements, embossed serial numbers, and certified assay specifications.

You can request physical shipment of any unredeemed vault piece directly within the Sierra mobile app at any time.

Insured Delivery: Deliveries are dispatched using certified domestic carriers in discreet, tamper-evident packaging.

100% Transit Insurance: All shipments are fully insured for their complete appraised value from depository dispatch until delivery.

Direct Handoff: Deliveries require confirmation upon arrival to ensure safe receipt. Packages cannot be redirected or left unattended.

Want to trade or upgrade your holdings? Sierra offers instant buyback quotes for unredeemed vault holdings directly in the mobile app.

Instant Account Credit: Accepted buyback amounts are credited directly to your Sierra Store Credit balance on our closed-loop ledger. You can immediately use this credit to purchase other mine reserves or finished gold slabs.

Store Credit Terms: Sierra Store Credit is non-transferable and cannot be withdrawn as fiat cash. It never expires and applies automatically during checkout.

Sierra employs modern FIDO2 WebAuthn Passkeys integrated with Apple iCloud Keychain and Google Password Manager.

Biometric Privacy: When authenticating with Face ID, Touch ID, or your device passcode, your biometric scan never leaves your personal device. Sierra only verifies cryptographic public key signatures.

No Phishable Passwords: Because accounts use cryptographic passkeys rather than conventional passwords, your account is protected against credential stuffing, phishing, and server-side password leaks.