Tamar Minerals (STU:LYC) ROC %: -12.98% (As of Dec. 2025)


What is Tamar Minerals ROC %?

Tamar Minerals STU:LYC ROC % is -12.98% as of Dec. 2025. The stock has 2 warning signs investors should review.

ROC % measures how well a company generates cash flow relative to the capital it has invested in its business. It is also called ROIC %. Tamar Minerals's annualized return on capital (ROC %) for the quarter that ended in Dec. 2025 was -12.98%.

As of today (2026-07-03), Tamar Minerals's WACC % is 8.39%. Tamar Minerals's ROC % is -6.67% (calculated using TTM income statement data). Tamar Minerals earns returns that do not match up to its cost of capital. It will destroy value as it grows.

Tamar Minerals  (STU:LYC) ROC % Explanation

ROC % measures how well a company generates cash flow relative to the capital it has invested in its business. It is also called ROIC %. The reason book values of debt and equity are used is because the book values are the capital the company received when issuing the debt or receiving the equity investments.

There are four key components to this definition. The first is the use of operating income or EBIT rather than net income in the numerator. The second is the tax adjustment to this operating income or EBIT, computed as a hypothetical tax based on an effective or marginal tax rate. The third is the use of book values for invested capital, rather than market values. The final is the timing difference; the capital invested is from the end of the prior year whereas the operating income or EBIT is the current year's number.

Why is ROC % important?

Because it costs money to raise capital. A firm that generates higher returns on investment than it costs the company to raise the capital needed for that investment is earning excess returns. A firm that expects to continue generating positive excess returns on new investments in the future will see its value increase as growth increases, whereas a firm that earns returns that do not match up to its cost of capital will destroy value as it grows.

As of today, Tamar Minerals's WACC % is 8.39%. Tamar Minerals's ROC % is -6.67% (calculated using TTM income statement data). Tamar Minerals earns returns that do not match up to its cost of capital. It will destroy value as it grows.

Be Aware

Like ROE % and ROA %, ROC % is calculated with only 12 months of data. Fluctuations in the company's earnings or business cycles can affect the ratio drastically. It is important to look at the ratio from a long term perspective.

Tamar Minerals ROC % Related Terms

Tamar Minerals ROC % Historical Data

* Premium members only.

The historical data trend for Tamar Minerals's ROC % can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Tamar Minerals ROC % Chart

Tamar Minerals Annual Data
Trend Dec13 Dec14 Dec15 Dec16 Jun19 Jun20 Jun21 Jun22 Jun23 Jun24
ROC %
Get a 7-Day Free Trial Premium Member Only Premium Member Only 0.24 -10.18 -6.60 -7.47 -4.25

Tamar Minerals Semi-Annual Data
Jun14 Dec14 Jun15 Dec15 Jun16 Dec16 Dec18 Jun19 Dec19 Jun20 Dec20 Jun21 Dec21 Jun22 Dec22 Jun23 Dec23 Jun24 Dec24 Dec25
ROC % Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only -8.93 -0.10 -9.43 -2.51 -12.98

Tamar Minerals ROC % Calculation

Tamar Minerals's annualized Return on Capital (ROC %) for the fiscal year that ended in Jun. 2024 is calculated as:

ROC % (A: Jun. 2024 )
=NOPAT/Average Invested Capital
=Operating Income * ( 1 - Tax Rate % )/( (Invested Capital (A: Jun. 2023 ) + Invested Capital (A: Jun. 2024 ))/ count )
=-0.267 * ( 1 - 35.02% )/( (4.005 + 4.165)/ 2 )
=-0.1734966/4.085
=-4.25 %

where

Invested Capital(A: Jun. 2023 )
=Total Assets - Accounts Payable & Accrued Expense - Excess Cash
=Total Assets - Accounts Payable & Accrued Expense - ( Cash, Cash Equivalents, Marketable Securities - max(0, Total Current Liabilities - Total Current Assets+Cash, Cash Equivalents, Marketable Securities))
=4.31 - 0.182 - ( 0.145 - max(0, 0.434 - 0.557+0.145))
=4.005

Invested Capital(A: Jun. 2024 )
=Total Assets - Accounts Payable & Accrued Expense - Excess Cash
=Total Assets - Accounts Payable & Accrued Expense - ( Cash, Cash Equivalents, Marketable Securities - max(0, Total Current Liabilities - Total Current Assets+Cash, Cash Equivalents, Marketable Securities))
=4.277 - 0.163 - ( 0.077 - max(0, 0.526 - 0.475+0.077))
=4.165

Tamar Minerals's annualized Return on Capital (ROC %) for the quarter that ended in Dec. 2025 is calculated as:

ROC % (Q: Dec. 2025 )
=NOPAT/Average Invested Capital
=Operating Income * ( 1 - Tax Rate % )/( (Invested Capital (Q: Dec. 2024 ) + Invested Capital (Q: Dec. 2025 ))/ count )
=-0.478 * ( 1 - 0% )/( (3.795 + 3.571)/ 2 )
=-0.478/3.683
=-12.98 %

where

Invested Capital(Q: Dec. 2024 )
=Total Assets - Accounts Payable & Accrued Expense - Excess Cash
=Total Assets - Accounts Payable & Accrued Expense - ( Cash, Cash Equivalents, Marketable Securities - max(0, Total Current Liabilities - Total Current Assets+Cash, Cash Equivalents, Marketable Securities))
=4.333 - 0.495 - ( 0.145 - max(0, 0.495 - 0.538+0.145))
=3.795

Invested Capital(Q: Dec. 2025 )
=Total Assets - Accounts Payable & Accrued Expense - Excess Cash
=Total Assets - Accounts Payable & Accrued Expense - ( Cash, Cash Equivalents, Marketable Securities - max(0, Total Current Liabilities - Total Current Assets+Cash, Cash Equivalents, Marketable Securities))
=3.761 - 0.364 - ( 0.195 - max(0, 0.444 - 0.27+0.195))
=3.571

Note: The Operating Income data used here is two times the semi-annual (Dec. 2025) data. The tax rate is limited to between 0% and 100%.

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Frequently Asked Questions Learn more about ROC % →
What does a ROC % of -12.98% mean?
Tamar Minerals (STU:LYC) has a ROC % of -12.98% as of Dec. 2025. Return on capital is the ratio of current-period net income to average two-period capital. View historical data on Tamar Minerals and its competitors.
Is Tamar Minerals' ROC % too high?
Tamar Minerals' current ROC % is -12.98%.
How does Tamar Minerals' ROC % compare to competitors?
Tamar Minerals' ROC % of -12.98% can be compared against companies in the Metals & Mining industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good ROC % for a Metals & Mining company?
A good ROC % depends on the Metals & Mining industry context. However, ROC % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high ROC % mean?
A high ROC % can signal that a stock is expensive relative to its fundamentals. Return on capital is the ratio of current-period net income to average two-period capital. View historical data on Tamar Minerals and its competitors. Tamar Minerals's current ROC % is -12.98%. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Tamar Minerals stock overvalued right now?
Tamar Minerals (STU:LYC) has a current ROC % of -12.98%. The current ROC % is -12.98%. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is ROC % calculated?
ROC % is calculated from a company's financial statements. For Tamar Minerals (STU:LYC), the current ROC % is -12.98% as of Dec. 2025. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Tamar Minerals Business Description

Other Exchanges TMR:UK
Address 167-169 Great Portland Street, Fifth Floor, London, GBR, W1W 5PF
Tamar Minerals PLC is a mineral exploration company focused on delineating critical minerals in Devon and Cornwall. It has an experienced metals exploration and technology team and has worked around the world, reinterpreting historic exploration and mining data to identify ore zones. Its project includes the Specimen Hill copper-gold project. The Company holds three assets in the UK, two of which are options on mineral leases at Devon Great Consols and Great Wheal Vor. The Company operates in the United Kingdom and Australia.