Introduction

Argos is a shallow, bedded celestite deposit located on the southern flank of the Cady Mountains, about 100 kilometres from Dateline’s Colosseum Gold and Rare Earths Project.

Dateline now owns 100 percent of the project. The deposit contains stratiform horizons of celestite, strontium sulphate, hosted by tuffaceous lake sediments. Historic mapping records outcrop continuity for roughly 4,000 feet with multiple celestite beds exposed in trenches and shallow underground workings. The project presents a valuable domestic option for U.S. strontium supply.

Project Highlights

  • 100 percent ownership secured by Dateline Resources.
  • Largest known strontium deposit in the United States by historical references and deposit scale.
  • High inherent grade with low barium: 24 rock chips returned 36.9 to 49.8 percent SrO (equivalent up to 88% SrSO4), and less than or equal to 1.26 percent BaO.
  • Bedded, near surface mineralisation that is amenable to open pit mining methods.
  • Four patented mining claims close to road and rail, simple access for exploration and potential mining.
  • Strategic relevance to U.S. supply chains, with strontium used in ceramic ferrite magnets and pyrotechnics.

Location and Tenure

The Argos Project comprises four patented claims situated on the southern margin of the Cady Mountains.

The claims sit within three kilometres of both highway and rail, allowing straightforward logistics. Argos lies approximately 100 kilometres from the Colosseum Project in San Bernardino County, providing operational synergies.

Geology and Deposit Style

Celestite at Argos occurs as multiple beds and lenses within lacustrine tuffs and clays. Individual beds reach thicknesses of about 5.5 feet and are distributed through at least 250 feet of section. The celestite is very fine grained to porcelaneous and locally replaced by chalcedony and jasper.

Dips vary from about 20 degrees to 50 degrees south along the 4,000 foot trend. Historic measured sections and estimates indicate an average of roughly 50 feet of celestite rock within the stratigraphic package in parts of the zone.

Figure 2: Argos claim block and sampling areas, aerial view.
Figure 3: Argos trench, view to the west.

Historic Mining and Workings

Celestite was first reported during the early 1900s. Production occurred during 1916 to 1918 and again during World War II, with DuPont and Rowe-Buehler reported as operators.

Historic work includes a main trench with short underground development from the celestite horizon. Published estimates in the 1940s and 1950s suggested at least 1.14 million tons of celestite per 50 feet of depth over part of the zone and conceptual potential to several million tons if continuity persists at depth.

These are historical figures, not reported under JORC 2012, and should not be relied upon for current resource estimation.

Recent Work by Dateline

Dateline assayed a series of rock chip samples in 2023 and reported results up to 49.8% SrO (equivalent to 88% SrSO4), consistent with historic reports of high-grade celestite from the district. A small gravity survey was completed, with the Company planning to have a 3D inversion model completed.

Market Context and Uses

The United States has no domestic mine production of strontium minerals. Consumption is met by imports, mostly as celestite ore and refined strontium compounds. End uses are concentrated in ceramic ferrite magnets, pyrotechnics and refractory cement. Recent U.S. policy supports onshoring of defense-critical chemicals including strontium nitrate, which reinforces the strategic importance of a domestic deposit.

Figure 4: Historic underground workings at the west end of the main trench.

Strontium in Technology

Ferrite magnets

  • Sr-ferrite magnets for motors and speakers
  • Large share of U.S. consumption

Electronics materials

  • Strontium titanate for high‑k capacitors and substrates
  • Piezo and dielectric ceramics in sensors

LED phosphors

  • Strontium nitride based red phosphors
  • Warm white LEDs for lighting and displays

Fuel cells

  • LSM cathodes in solid oxide fuel cells
  • Also oxygen sensors and energy tech

Quantum and timing

  • Strontium atoms in optical lattice clocks
  • Ion trap qubits in quantum research

Radiation detection

  • SrI₂:Eu scintillators for gamma detection
  • Sr‑82 to Rb‑82 generators for PET imaging
More on Strontium Use

Next Steps

  • Submit and finalise permits required for a maiden drilling program.
  • Drill to confirm thickness, grade continuity and bulk density, then define a JORC-compliant Mineral Resource.
  • Undertake metallurgical testwork on representative celestite beds to determine the simplest processing route.
  • Expand gravity and surface mapping to refine the deposit model and target additional bedded horizons.
  • Assess options for offtake into U.S. strontium chemical plants and magnet supply chains.

Cautionary Statements

Cautionary statements: Historic tonnage figures quoted for Argos are from mid-twentieth century publications and have not been reported in accordance with the JORC Code 2012. These figures are conceptual in nature and should not be treated as current Mineral Resources or Ore Reserves. Dateline has not yet completed the work required to verify these historic estimates.